Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbfdb05748324ff…

MALICIOUS

PDF

89.5 KB Created: 2021-07-29 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6bf1eb71b0a20abad444f1e64ea293d SHA-1: f83787fb791362e854bc2775fa5116b0bb900096 SHA-256: 7cbfdb05748324ffdd82b717c9c8914c039edad17759307b8c60803dc2060c87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting. The embedded JavaScript likely serves to facilitate the download and execution of a secondary payload, as indicated by the PDF_JS heuristic. The link farm strategy suggests an attempt to obscure the ultimate destination and evade detection, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=rewriting+exercises+b2+pdf PDF link annotation
    • http://doks-films.com/pcms/content/file/90730948354.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1f96d2c4---68626628271.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/78954625588.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0088459ce1---datufezutupawivesene.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/vexenulamepunarexire.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a742b5e0f---xikibumunufubovaborosib.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd60a3a4d3---5108855946.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/29743647752.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e200cbcc---dewudexutukiludokuzino.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/vevemifikotus.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1ff0b6fc---tironupixuruluzoxoruviwu.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/65830048264.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6irvj3tub4qr4d1oqgsqgfoqd0/72192579014.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/bewomezipipumoxajedot.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f4081563---50088998677.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vke769icb8rln2sv7ba0n58jn5/49745710831.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c167193e7---31841713059.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/66931519317.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/towawusukivobit.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0d68ebbd11518f4ca79d1184e82bb587/20568600972.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098540dded0c---kaxorigu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f332d9ad1---86915398635.pdfIn PDF document text
    • http://babamoleskine.com/files/file/84598290211.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wotimisaximapez.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 19524 bytes
SHA-256: cbb40a03cdc7d1ffb943f4a6a6c64d8fec79e27ad738e39e68a2c9b95fd8cda2
font_01_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 10960 bytes
SHA-256: 11f3bec0eab3dc3bfe0945f4879cda2c56815d62fc77c229e39f08dec880175e
font_02_sfnt_off00014df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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