Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0755827905b2d2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 08:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7fea822933d9497a88ce961c7f85fcb SHA-1: c5fbe99eca6a267bb36470783dbb5b308d19b99a SHA-256: fe0755827905b2d26c8a2c4abf110474ae110201ef7dc7754ca78a5e48bebcec
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or directing users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=functional+analysis+walter+rudin+pdf PDF link annotation
    • http://ballmillfactory.com/d/files/pajazi.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/lofuja.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/renimoto.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/43616172232.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/wujapadojopuxuwowupi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a09178bf---riditizilojifisajofo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ad1f11c2775d9db66c050bd471785332/9953642840.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/il8efr259pq9e0ol01gp3ankj2/mesofijiseviturobigiba.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wedil.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tagobiwoxaruzudejogi.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/802c37adae36acc26d562726e71789de/womuwajaj.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4bfdb19d---12421526739.pdfIn PDF document text
    • http://teknis.it/userfiles/files/mamoga.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fc43b601d07b4a896f00394b114bc7c5/12550505358.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/7836737192.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66820a4320d7ef034d2e059e3e130954/fijedurisasogakimunom.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/u9f2nf2tj6sh8rdpspf5ft219c/jogadedevifibo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lc8dlnf8govqk9hdemmgr0ti11/zewidufo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/29462597337.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/53959951040.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/78b36d4d9e0199f0f3deaf4d74d008f6/mafoderukumusetem.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vekapapenak.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_off0000cc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 17888 bytes
SHA-256: 59a336f379c67cb234354c5ebd57ba3e447209a51f391042928a8cd15993d16a
font_02_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 10888 bytes
SHA-256: 4922cd32b9f7f3bb0e6a04af435773375cbb418f0e63a194370749047bafe94a

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