Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b7ac0aece10b55…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 21:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 119e7837e49cb560ab42bfb9c0130e36 SHA-1: a28c4b8bc4c275ce1fdb144969743e46af359f8d SHA-256: d7b7ac0aece10b552ed0c2c9d11492fbd5241d5cd35959c292cb4ac19f2f5b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads. The embedded JavaScript likely attempts to redirect the user to malicious sites, as suggested by the presence of numerous unknown URLs, some hosted on compromised infrastructure. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f59505b9ec38603298359525fe6d51f/merazasugafeguwoxeju.pdf In PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/ziwemepuraduwukipusologoz.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e6fcce86886aab1f561d12aba2615c90/27049693123.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/86733818427.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160700dead2f95---36716007836.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/71328755797.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/ditinamaguz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092814c9f4af---91942449808.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c36bddcae---tudapogowuwu.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/10007868590.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/cvrav32ffmbkursgs6o7h0qluo/wazimabozogoxiw.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/legixut.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c8b8f489---zogoxekisafupisorimekizas.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/18510543008.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bifasalaxatob.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/50598716914.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/vuwewofolipekoduvadufam.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/90752596426.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077784e46f71---zirizinaxumuxof.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/58286491077.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/98rbps7qhpjv9hdm305ls4rt30/93009667715.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mokedupapedoxuvufota.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/19980068054.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/96371449668.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f508d05ab2---feteno.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/5615013629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convertir+un+archivo+a+pdf+en+lineaPDF 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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 20244 bytes
SHA-256: 95459711f602732a28660e73583b7ff0aaa1553bb03b482dd0f7f0a7aee06e2c
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 10748 bytes
SHA-256: 042cc718fee063e76631155cb2ac6030a66bddf33c11b3ddf24f1b8d33988c2c

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