Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ae7f880ed9264a…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90f326882c6f882ea2267cc144817037 SHA-1: 8a3bde74a845f3ee79c0d116bd0428d8bbd2f879 SHA-256: a2ae7f880ed9264a53f5565dbf0719cbb5570428bfc1c45764e015a5b90c9c26
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to these compromised sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=sample+cpa+firm+quality+control+document
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/dc253d89fa4ddeb128674b6ec74777d4/23747819686.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/29478351484.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d1f68cb0---bejumadeg.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/78km8p0uheldksgmsldhvs9e01/58151872499.pdf
    • http://sanarina.de/ckfinder/userfiles/files/4440927696.pdf
    • http://mav-auto.ru/images/file/vinul.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/mitvusb5s3vmtqcr62eed4lp47/nivetogavop.pdf
    • https://colakcivi.com/userfiles/file/silevetabut.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a99ae8594ebc3b766c4f6fd9e6c42cc1/dekubimidewosinokafe.pdf
    • http://adabaskimerkezi.com/upload/file/jozaxezifor.pdf
    • http://nuitsdartistes.eu/images/file/15815465251.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/df6f777c203359df8431ecab337ddbab/vifesomuto.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31df541e9e---25169019114.pdf
    • http://all-pass.com/folder/editor/file/85464627270.pdf
    • http://bmsorganica.com/userfiles/file/38498684039.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hj74ul62nhaf6717ne64g908so/penixi.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a16eb79aac6---pizavuxuwabavijutezoga.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3ee9b788af437ce68233a2dde28f13d6/xamaduwawanapojuzemawamaz.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c588356de2878cad9a0fc67ca55e9810/wigikafow.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090109d09b76---83031393603.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f61bff94---98308057638.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921d20a093---92939400068.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160828042cecc1---magojizutabupevezoragek.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573f920662---fesukateputufakanewesogim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69d.bin
f5edcc1212b6eaaf8bfb2cff1f70c9ded073c88d7e59100e3013501abfda1368		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 11048 bytes
font_01_sfnt_off00010018.bin
73d476f4f80e3824d69c747b32b6e0713148c6760b52b293cd061572e244f553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 16116 bytes
font_02_sfnt_off0001298b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 16792 bytes

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