Malicious PDF — malware analysis report

Static analysis result for SHA-256 12af2878ec47d0f7…

MALICIOUS

PDF

105.3 KB Created: 2021-07-05 22:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4470d8b4f9c76a103deb0c9f7c0240b4 SHA-1: 16e5ab7ece67cb5f9c903f96c68c8effb4741e70 SHA-256: 12af2878ec47d0f7d2c80d4021f73b8e986bd243dfef6673e8afe979d839422e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. 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 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091894320a4a---zasusagusupisus.pdf
    • http://rolmech-strzelno.pl/Upload/file/40629586937.pdf
    • https://10glazsikeyrosa.ru/file/dowapoxirimavavuzazimo.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5nsp47qe6nk3ecgkrgq6n09ig1/57551336451.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a86394b2ffc---68873544053.pdf
    • http://brandnewgoods.net/userfiles/file/47677279034.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/44350f6666bc8701ac9368e82efd3df0/66979804878.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607422dd74bb9---86987073962.pdf
    • https://arredamentigiacobbe.it/file/xiponafororokoxa.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2309274b---49608632614.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090a553d1d15---gutefipaborid.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24dc53bc9---pivariromuzipoz.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qe00r6nr41l1scco931e5g8pgo/vizakusebowewadafewo.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/uq9vo631k1bm0nnviv2nntfs83/8187205111.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/81845400545.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/288923131174a956bdaaaeebd72fc08e/93825768497.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e193ac71ea11581e2dc94f9d5b51474a/robexerikidepovijoru.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0cb125d826b40c22e3ef4d2248a05a07/14458125549.pdf
    • http://beiks.info/public/file/zofusikorinenewotunodisu.pdf
    • http://dragonspond.com/uploads/files/83104138135.pdf
    • http://uniradioweb.info/userfiles/files/38606210835.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/05881bc129ece69a66adb4b5bff32bc6/bogulujekawivujo.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/xavaj.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877e2a6755---18596811096.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=not+for+profit+statement+of+activities
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001398a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 16792 bytes
font_01_sfnt_off0001519c.bin
3e2671e715d9d72913b3d35001939c4b747ee210facc830ba0c054c6eb5d926a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1519C 17496 bytes
font_02_sfnt_off00017f28.bin
305d9041a5998dacaf97bc4d824cb7e96589ca7e00671180ce79c5f09d16ec37
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F28 10640 bytes