Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42d342dbf2336f0…

MALICIOUS

PDF

87.7 KB Created: 2021-08-13 14:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7c934383972b491ba7175bc4b687e22c SHA-1: e55874d8d6b16e826c31cfbd46d5b0c1c19e9c42 SHA-256: c42d342dbf2336f0bd0d6632f586ee79b73ad2af40f2eb7b979b105044c7044d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/882424247.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc0772cb1---bavewut.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/bukusilitusux.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/22645033833.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/vitexi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tl1v14bkv39hd627ofunqoq1og/xeruvezuwesugixodam.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/14785312249.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210621112709_35522800.pdfIn PDF document text
    • http://denge.aero/upload/files/75379541100.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/46164777675.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606de2554---nuxegafopigiwomuraxutigaj.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3d7b6c69992bf43247d23ade61ce8f40/93744028860.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2ea299fc9---77581192084.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/dejin.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xogivorubifabaderur.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/38307519552.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/repogobutexasebok.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/67659002611.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7d87b56aa275d5d076664171a13338b5/mivepusotuzigoxexavigeze.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/90880585628.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rgtudfldakc8070huqtpds7mj4/61494769057.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/tapenezawakanasuperiki.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e821722674b---jigedijotuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drawing+nets+of+3d+shapes+worksheet+pdfPDF 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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16988 bytes
SHA-256: 5b93f4157ca2cd578c9af0995e1079097c24c6bf9206b17e94a34a54504d566d
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 11080 bytes
SHA-256: 547b13944a45725816145239056ecae06a2445afeba023b208ebdcad03409bbe
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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