Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f8ef6432bce35f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 21:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 717d08ab0df88d61d755f6185f5f9e52 SHA-1: 9caaac4b32cbefebf4993f6121c6897f08f79c86 SHA-256: b0f8ef6432bce35fbf130652fbf38aef69cd48cde6582e0d83fe51b9f2261b4a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/uplcv?utm_term=psychological+causes+of+hoarding PDF link annotation
    • http://alliance-ic.ru/uploads/file/kagotajegezarepejisor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fvg4go8c683cinn2b1h1p78eqi/53535297896.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00f3ce289---xajarivu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8a69dae08b33fc351dbaad9118ef8ecf/najomogodebuzobofujele.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c91e2b319---wudaxipatogewuwinof.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tavebijolaporowefafara.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/70013709178.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/49190538456.pdfIn PDF document text
    • https://oasis-travel.ro/files/femigiwumugosu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8626b6a893447702d4ab3f16513ef985/pasajibugamaxilazuvepet.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/lusez.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/73393975674.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/78775091083.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5d445d511---wajefakoretunila.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0daf00571d---gexikikufewolobi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b953b6155---40840885486.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ht8dittl7q8e30jj0a4tfovbsp/seweju.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160932707a6d94---dajupu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e55f6801db3---tujaxalobidosuf.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/debuxobibebose.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10872 bytes
SHA-256: 7b687100cb4ef1fb42b34dd427f25fe9b2b42f9a387aedcdf2e0a974782a7624
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 17984 bytes
SHA-256: 0e8624050139e49f3c24073ea3aa1e52b09cc3ab6152cbbb2223094b8a7ae650

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