Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf3642ef0a864d0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 13:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43756c5f0d5119159a46217f0e88c3e5 SHA-1: b8e6baf91a5be6cf0212987f26e1aa20a586bba5 SHA-256: aaf3642ef0a864d073941cc92f83711d5445a4f5b78a9d3828d2f0b86e3a8e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=sultan+tamil+movie+online+free PDF link annotation
    • http://ydchem.cn/filespath/files/20210909113123.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/luvivupiguxoxurejajuri.pdfIn PDF document text
    • https://penal-garazh.ru/files/wodunikujexugidijokakilir.pdfIn PDF document text
    • http://mopron.ru/upload/files/bebofobe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0f765ba67b2fee3a2db8bda8f0e529c/pogozaporaniv.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/6466065375.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63572443693.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631020832_0d8fd5de75.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vijasoxumum.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/83898163757.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/roluzitusavakexatodar.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/bopezevaja.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zupowazamaforavowenozex.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/tatako.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/80292114834.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xizukemepulizitudowabupex.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fexunakibavefomaluriku.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/51796355330.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109061521158489.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1eee089275f5e8765f0babc081ca45c2/79509120514.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4b5c0ce0---71032136495.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pubaregobiz.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/908036492.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358427c32db---98396788413.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911135104_1615389662.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/kezizetujekasewewa.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_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 14580 bytes
SHA-256: f0a9189287fe6f3b51a49fd4b553afc8942118a0afa9ffbc538c68429628decb
font_01_sfnt_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 10448 bytes
SHA-256: 69dfa11984a575090fea455450c7bf3a0f55730bbb23578226416e5340ce39b0
font_02_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1