Malicious PDF — malware analysis report

Static analysis result for SHA-256 7156ff8a1b7e8726…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc07db6aa4af1ce0c77c647fb04ddaa4 SHA-1: 273356edaf3c92c73f80e88cee2d8d631fc698de SHA-256: 7156ff8a1b7e8726b91f8c4b2bc735f63a3f46025c5d2f1cbbafd7a54051ecd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://terralis.eu/catalogue_dynamique/file/bemozinisi.pdf
    • http://donateagift.eu/userfiles/file/dojomanezusetilanurex.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cf740914---xulupixagiwu.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/64231162544.pdf
    • https://biothiennam.com/media/ftp/file/telora.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4363afe818a89b9f5a9f3ab7d7ad7947/fimakef.pdf
    • http://dashoernerboot.de/userfiles/67087649714.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/39155092286.pdf
    • https://mariellatriolo.it/public/file/wisaxikir.pdf
    • http://guojingmall.com/userfiles/file///pisepoferoxo.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98b63223c3c0e5682f54d04f0a0e44f0/65818651335.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f07bcf187385a1dd28411f2148a1cf0c/zijokojuvasaribasuder.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/rupexokagikabojufaxup.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e6e0cfca6a57515678aa3b983653b1b6/dosog.pdf
    • http://jshtextile.com/UserFiles/file///58883894869.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kle9r5ueg6vr713c7ab2u6b6nn/nugokepitijofenod.pdf
    • http://anhbanglaw.com/userfiles/file/54120320055.pdf
    • http://webhenevents.com/clients/868374/File/2185879132.pdf
    • http://mispuntossaga.com/campannas/file/zakexirewesexiso.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9d5e3d4d---39779929333.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9cab1db79389e259d2fcbed96ee4af5d/80182072329.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/54153494584.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4a3d6eee79c6649f5baa919f4b9cf6e7/tomugibidokafoxelemixama.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/536e5f903ee55b1bb5e554f809a3b8be/poderatajufanoko.pdf
    • http://boxethai38.comupload/file/bagusosimanemugo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=doping+in+football
    • 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_off0000ec75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16792 bytes
font_01_sfnt_off00010487.bin
55ded6c7caf03ee391cfed95d8b07943782c34e584c8be4da2bcbd120789da02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 17896 bytes
font_02_sfnt_off000132cb.bin
cccddfe3811f5487dc5c8fcd8a0b469c7ee3f61831618cf794a29426e1be84f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 10272 bytes