Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a68915511079e1…

MALICIOUS

PDF

92.4 KB Created: 2021-07-03 19:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa375b8646f138d8f81b5355af2610b1 SHA-1: 8f61e4d1b498700fa82f6f8f96dccbcd8f0bee9b SHA-256: b1a68915511079e1fd1b0bf1c4137f3004884b5795f7392ed27bcd777683bf3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially harmful content. The presence of multiple distinct hosts and a high number of links suggests an attempt to obscure the ultimate destination or to distribute malware through various compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/987993f9b44aaffd5398a279f7028260/napimudivajubalolibamuze.pdf In PDF document text
    • http://meteosputnik.ru/userfiles/file/vebufosudevalaf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c327ada1.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/17886a11c588a536a4442709a5d3456e/kozowusavopogunivez.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160881b0ae43a3---33966838133.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9595e6c2d190420a058a0d862850408c/38137371866.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/mevab.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vigukanexijudurizomefenu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/fidubike.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefd903e0a---mapofelimuwa.pdfIn PDF document text
    • http://newo.ru/files/files/8923439143.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/cvoktjsqjvbd55f6chl5uh2bv7/dutonivamonisi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16074758ac358a---80745005835.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/58d3d331b227ad8abbcf18e297f36af8/65487997517.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83fa9689a---13500471341.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180844fb87---tupowokoxofidimuluna.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfddd2375---91549633514.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/fipevapije.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/57543321431.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/171df496d13c15bb814cfaa8d776e36a/34286381035.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/rofibukurod.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/48129210237.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d31f755c5---dusiduwelegopesasevowidu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01ee20247---mofetatujasiranepizowas.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/tekinevatixelawiboforo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wheel+of+time+japanesePDF 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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 17484 bytes
SHA-256: 1ac842755b336546c51b01b85f04456afa9f228a1957975942c75f96b4731af6
font_01_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 4824 bytes
SHA-256: fc94367424879e44e8c1749ae5cb5c043782d2d47ebce63389027c791cfe01f7
font_03_sfnt_off00014b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9B 10648 bytes
SHA-256: 0b1ff1ae44eb81af75b639984b160fc2ec64d23a190947708f81711fc3f5a304

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