Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef76f915ab47fc2…

MALICIOUS

PDF

88.8 KB Created: 2021-07-03 09:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cac88d74bb87b8d04e2d6eb1d6aa9e77 SHA-1: f1804e72088e3918bb3bb209b47285a49c544d56 SHA-256: fef76f915ab47fc290048a1263c5274623d4521e7a6b0b1079df67049540b4e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=average+iq+for+a+12+year+old PDF link annotation
    • http://ahchala.com/img/file/6579214271.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kons784jlfobsnc9826sd7q3ep/dodajasari.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b364611f1---bewil.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099edbbb4974---wutimapavotewirezot.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c8d0ea539---38568216533.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abc1f77b17b---rapezoturaxetip.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/2760789465.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/91290679727.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa318dc1c3a7814f04260b26995e47f1/67666380164.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/63578641808.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18d8311b6---78502322602.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c292a3d76---dukevufakizoranofuk.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1ca2950115a43f05012fd8cf0bbc0da2/61415072775.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/vomalebivibu.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/40664487665.pdfIn PDF document text
    • http://renovator.cz/files/file/33590280747.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/wesebewogiritaxuwibezik.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/98962417295.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c755144b3f---94037263361.pdfIn PDF document text
    • http://bio86.fr/fichiers/69612238332.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa211fce1---sususazonefafelokowizuf.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2810c9bf---90132217338.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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 17336 bytes
SHA-256: e41cf8fb775fb6de74351ae46f4a91e9d6f4305d02b5d4a34261b0390302eb1c
font_01_sfnt_off0001262e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 10636 bytes
SHA-256: dae4dacb66b1c8fd86e3d4454bb1ef8b93acc76d676d25826c30f05e4ce302ed

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