Malicious PDF — malware analysis report

Static analysis result for SHA-256 884331bc7d666e74…

MALICIOUS

PDF

89.4 KB Created: 2021-08-13 20:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e761e907a2ec0fd8b9a69edcea848c9d SHA-1: dd6fbe666b13ccd99a6929b37850d971db39c547 SHA-256: 884331bc7d666e74c678d31f0d55e64303eaa6a54e9bd40adde2a9e6a3550a79
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://railwaysrailroads.com/upload_files/files/nuvuzejudupodukep.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/milibozekamugogogowomusu.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/fokufimovixikovugazosawi.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6385ar7lolcuv3koqopm9gbm8s/89969433216.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/wozol.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00e4499a786ef802f6a7cc3eb6c926db/13073111463.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/7008192212.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e54bb6a10f6defce769ff100df43cd40/55251039227.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/luxizuvokivaga.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/muroximotulonoze.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/565b1ab8a937653a2e46d923f0dca463/53496660144.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/855c87967802cafd2ae26564ad8b17ee/52194066411.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/12618691730.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/95860198940.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/durotegunodob.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/15938057873.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090257cbf09b---12790017094.pdfIn PDF document text
    • http://oodow.cn/upload/file/210813225620895836bv3w1p8ho3uv.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ajo11tdqoqhjv1o5kds3pbbpgg/xigefulakezijugoseni.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/zejufego.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/63c4eb6c4ba4f60ef130da629b36c8b1/gesukaleridajasegebis.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66172788321.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210706223721.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8455d896---newededegabedugajiler.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/puvijajuxidanuxagipomu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107b1c0f2615---72951189684.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/31668104250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=when+urine+smells+like+maple+syrupPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 17652 bytes
SHA-256: 581b53ec2d3b82910266b7256062771832ce2e69914940faf173f103284ba799
font_01_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D15 10600 bytes
SHA-256: 6632231de4a220df58bb77b86a6cbe3a033a9ad739424aed3a8ebccbff111a88