Malicious PDF — malware analysis report

Static analysis result for SHA-256 57539a5ff20c32a5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 16:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff9ba2d1c039e3796ded4cb5fe9013d7 SHA-1: 658649abd3a0b594bb2ca96c3269cf933fbc4409 SHA-256: 57539a5ff20c32a52cf05ed479ce089607e45eae5055d10fc152af956a78b5cb
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to other PDF files hosted on compromised CMS uploads and disposable domains. This suggests a multi-stage attack where the initial PDF serves to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=minecraft+pe+pokemon+addon PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2614de201d0ee5119e19a49f5e0740bc/pupig.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/98947758903.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/21590079362.pdfIn PDF document text
    • http://canvangdientu.com/images/file/72845684848.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jaxinu.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/bezosejel.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/jilafevuxepuz.pdfIn PDF document text
    • http://techbis.pl/files/file/pofema.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/85e708e25404344cf1030127efb779fa/sunaxoxazajine.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/62250105114.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ee61410e---tovuberada.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/ladomosizorodokorawara.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/lavegejasenebilepalufu.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/339443372.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/tonixurozedofax.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/6456059525.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/80280362183.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210908115225.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85ec339b4---natemadalakoxefutar.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///21285436487.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/29124591746.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03dcba703---60493300024.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/8383183636.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/35260536962.pdfIn PDF document text
    • 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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 10652 bytes
SHA-256: 462c653d5919d0a6a04af2a85796405a80afadb19a6557b4c3716ea71aa1cca2
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18644 bytes
SHA-256: 0ccc007c51768a9a6a9f60b2b6b5536e9f9894f9bf38925a5a3f5879783dfaf1
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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