Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae370213e74bc7b8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 11:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e4a9ea0fbc83899a732a2ee1012f16ec SHA-1: 0ba5969531bbc97e7254fb4086016a1b68f3f33c SHA-256: ae370213e74bc7b898a65539598111bb4e780c8a65a4ccd441a5742463360f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites hosting further PDF files. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608445e76aeb2---59528969151.pdf In PDF document text
    • http://quaint-house.com/datafakidaginozupodo.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jukunupisopawufisifaj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/888c757a69a4494129ac26f3c2ec4450/32556275169.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/wodelubebufobi.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/ladigetifir.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/90198818419.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080449b0ebf2---buxoretarunesonemodu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/folabususesebexor.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/fedelufubulorul.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/liwamat.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gadokiliben.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9ef607e81dfd010c18b742e877c791cf/pazumigisijoragow.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/vefinexog.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/99906882319.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884885ae840---winezuxuvobazavopija.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db82ed91fd---40942465524.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/silamodazenusimowa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115eae04f8d9---65406066503.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215191242224882.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/gomewuxasopivosenuvu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/23458841305.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c739d5b995c---30578706126.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rizifofejuburule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pdf+viewer+windows+freePDF 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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 10192 bytes
SHA-256: 61cdf859ee5bf2d530a0ef83efc2cbd49bcf5374f902415c7b5bfba9e1d7c7a2
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 18244 bytes
SHA-256: 096cdbb799b6a704d3ad872642634d2733f09e6fb99b202e52bea2de51e2533b

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