Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2de94a11df27592…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 11:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a18af9816c29dfc406647eeb832464b3 SHA-1: f195c2504dddb758f922bc945a75a8cbf161511b SHA-256: b2de94a11df27592507d76ae6f51a6fbc731a0c18968f5456e0b0c27979e2919
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomaquito-travel.com/editor-images/1663670814.pdf In PDF document text
    • http://uptownchantilly.com/uploads/files/jujijejujodonoxi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fc93ce92b00c2c2a68bcc9b3e86d4e4d/remeliv.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/pokowizejolurowor.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/2a26e680b99df7392f45e66c167be032/59849760689.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a2c011e377abcdeb70afceb844752fae/60031778016.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf204905965---xajep.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/15137209265.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/korineterupiwomogota.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094aaa6cd82e---telujiluxew.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0842d3fbb---63594479204.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/fefiledinuvu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/rulegitabetoxut.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6epoa9n3m73kqobtg7bhblv5h5/mujiwuriladiro.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/91822892823.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610be0564a0b9---gejobotifenubezebarovad.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/52287590369.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lhkhqfgucskvmgs2178th54vne/pemobedabozajureb.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/90612963468.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/novigomu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/10844261427.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc99f16b3a---talukemibijexefapirinera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=intermediate+level+story+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_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10792 bytes
SHA-256: bda71ffc6d0d16e9aaafd64904be76d66d94865ab1fde0a717b866815a693198
font_01_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 18936 bytes
SHA-256: 74958f67262b3fc879c7b95d393bf26f9c9c5dae4658a7ab8cd1f88dcfcea04e
font_02_sfnt_off00014b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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