Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88700a9a7aef550…

MALICIOUS

PDF

94.9 KB Created: 2021-08-10 16:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f92d4b5414c57fe3fadb40f3b75e1fb0 SHA-1: 7d6d10faa2778d5ccbd3562c3c8471bcee087b3e SHA-256: b88700a9a7aef550a3a6451652e1f74820a3a76816dc0d58c7a341bb6ec374a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b806d00f84f---31043379613.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/48a9fce4c0cb8b289f1de00181ebbbe4/52067638423.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160723ce6cc330---10885368094.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60277600a9---runerabinasitotenaf.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021073007305750.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/wufekixunar.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/sabujuririkag.pdfIn PDF document text
    • http://prestopc.it/upload/file/1617253538.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608176d78eb3e---kugimikogaji.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a5c0baae548c66d6000abc58382dda69/23797567658.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e96dee92f---meguwiwujatotinefegopom.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/pekalobinebewe.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/47995351761.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/46df2f4123b3ba7d9ef111edb936be60/50612680204.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/445f0347aebf508c40f59c1461ffc39a/konelifeputematibajodaz.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2fe8b04b065ccfbe1ef859f445fb31a2/mowefa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd239967d---63508300022.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/47372701998.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zutixovesitudolukorapizu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/576b8a911f35efd9831b6756087fe816/fozekozi.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/27296347288.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/26352872902.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/26438839458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=winkawaks+cps1+roms+packPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 10480 bytes
SHA-256: 3a335082ef171ba366397a87fc43faef01a4115d433ad60417a05e4889e55cfa
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 18108 bytes
SHA-256: 5d07537b09f87c29c62f0f137177ef8ed98a325ca7b11e62fbc4f59c7320a48c
font_02_sfnt_off00013998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13998 8376 bytes
SHA-256: 84a54135463e5be8e382e19ef47af36235040e25633cbea8173bf1e8cfdf6964
font_03_sfnt_off0001550b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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