Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d48be51d5869c89…

MALICIOUS

PDF

92.0 KB Created: 2021-08-11 19:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fff5e98adeccb46e65f3a8c3a9b94206 SHA-1: 8ae7b5b427090d4ac8a0ae135c837966767d718a SHA-256: 3d48be51d5869c89e9f150236b378cf378b6d3b879593bdff910f069bd107e97
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, likely due to its phishing or malware distribution intent. The embedded URLs suggest a tactic to lure users into clicking through to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/stl8rgpckrlnjm1omm7raj1mr1/bagawekipobu.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qb2201ibaqmeh2smrb6httvlc1/mifekoliguwaripujotafe.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/gubobijurimirinawe.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/86337600.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pemuzididoduxafobole.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20f6ba4d45614584b9f43fb68eef8b49/kuvafididuso.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a22b577e0a6291dd56286ede9975cda/lavumu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a428ece6257c2db05516491c344a3af5/nisewevepudixawiw.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/nepijuvowenovel.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xozumozofabesuj.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/1deqvj0gfg1v1t3srqo9525ls5/rizipovovimejaguni.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/velitikefomufopepesami.pdfIn PDF document text
    • http://dnepropress.net/files/file/15477498897.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/26734264882.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/3248474750.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/jeseleb.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/74152497642.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nofununopiwilulorijuvejo.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/vobefirugebemiporaxamaz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee805bfc6---lakimupoj.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/bunenebiniwitop.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qip90em8bq8etje58b155gnpg7/tevaxefezatizoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44876ebf9d---numeremazoluziluwanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+are+some+higher+order+thinking+questionsPDF 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_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 17136 bytes
SHA-256: e25fd01e7b780d615b76e065f082a07f7984cd6caa122828df7f397069db79b9
font_01_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10980 bytes
SHA-256: 0c621ee55647a916babf4750de0f098f2089774158be4b384488c3aefac1731a

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