Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89328d0f98ed924…

MALICIOUS

PDF

122.1 KB Created: 2021-09-03 07:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4627774ba61204fc36c958081e9f7fc5 SHA-1: 2a22e619b5b112c59b57a97cbd4c3df8e6616461 SHA-256: b89328d0f98ed9240f4ed3fdaf511c09d6add4c93b102a6f45681d54e54e8732
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3abeb82c0f---91325870555.pdf In PDF document text
    • http://plncse.hu/php_data/file/17433461662.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef1ad5f6a---feponofalogexugatutofud.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/laxigup.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/80735193334.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5nnpdhatr2lc072ieg644k8g6d/61942595670.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/77830191093.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/48156041284.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a54b89fc---soripepo.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/53421432493.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcc0afdce---28658767045.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/75624694575.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lumodupokipaga.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b335ddd50---83841891679.pdfIn PDF document text
    • http://praguetransfer.com/files/file/gakasusadumuxujidepa.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/nolajitozawumomabifizi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087539c646ea---mexepovaso.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/70952286225.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gdao96rqh12q3m00k6gpqc6qj1/mumowopawevar.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160740c84de5b8---surorajotovamas.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/46bf40a433ceda13608fc5cde12c84a3/gukevekagagubafiwopobolep.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/193868117.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/77976857152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=revista+boticario+ciclo+7+2019+em+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_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 21708 bytes
SHA-256: e69937ead0dabf13ab86dc533638243b3a25283c3cc20460e489d81f55512f5a
font_01_sfnt_off0001a7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B4 11440 bytes
SHA-256: 616a541a75f7fb1a0ce205fb81914d654685e46134f0c2c6f675504c4d5749ef
font_02_sfnt_off0001c2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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