Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad88b3d57c941dad…

MALICIOUS

PDF

104.7 KB Created: 2021-07-03 19:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aab60edd2684729102fcb0bfc7c80711 SHA-1: 77947087ffeacf2af328ce4342d7e002d164ed41 SHA-256: ad88b3d57c941dad4be81908e5aae01f5d3588b96e566e91098cd6f9bbd40765
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of 'cmdcm5d96urdsfu9euhb1tf64/13941338651.pdf' in the document text further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=prescient+meaning+in+english PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tlvvmgth0fcann6ft2iaka8gn5/japowipugaxifibo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/94592099180.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47e57c1fc---20761881215.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/webexo.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/86303373363.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4cmdcm5d96urdsfu9euhb1tf64/13941338651.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e655a89db---46201729417.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/73eef7c787721af555cf0729d096777c/xuziw.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6gacjnrp63qj78qi5jbq6abhk5/xobowuzu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/18cf79df563404ae0695d2a52f7d607b/tolumexewavarobafexowid.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da5765851f0---kogipomowuzukipasepig.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80b2cc47---95005518814.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb66f15df---69938347212.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5899cce4ccbaa85e8abe15f418d6c002/fexopumobapan.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081849188dbe---xokekabogukenudomimo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f02784b164f7a4e718cfe89a69e0c29e/sigeposibarakuguvorosu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/96580316054.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d33285df---51428977332.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60a414f83---82022013223.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/32751623631.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/27902497864.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8cfcb10f---vujomu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/67869842781.pdfIn PDF document text
    • http://queuemanageIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001066f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1066F 19352 bytes
SHA-256: 36e4e82493c1e2540950d5d65bef55fb4859f783775c31c3f6872380b9708362
font_00_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10556 bytes
SHA-256: 94f032f1247dd6f1e4d1fc139e0c013a3dc0e2cdc170f5eab9c7fbcc51b7f22a
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 5436 bytes
SHA-256: 72d1da260fcac9ce6859ed4877fa5072a029b4bf9b646805c104824e33f4ea30
font_04_sfnt_off0001527e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 26508 bytes
SHA-256: d262156ec6649db81f0b690952ec7378a9f20b9c50d5cfaca4d42d3ed5b2c199

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