Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d17cb1b57acea…

MALICIOUS

PDF

112.3 KB Created: 2021-09-06 15:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d49b33b1e8951937fe3ac09af9256cce SHA-1: 8a0f9f52af73a5044e6dfac51ec2eb69606de5ec SHA-256: 7c5d17cb1b57acea1b69684861daae7c8f12982de93ebc0efe61df03e46b34d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=learning+chef+o%27reilly+pdf+download PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091242827838---45688106264.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/17219531089.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/mowel.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/61435006706.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/9924429745.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/63787197932.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb3d7bab3---pirafenajopit.pdfIn PDF document text
    • http://iphysiology.ru/upload/koluzovozebadononusurep.pdfIn PDF document text
    • https://rinducm1.com/contents//files/92747763522.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95cf05f55---81910524429.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080585b0844f---17433026372.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/54f45d612637bb03eb311e151a562afd/woxibuzafakus.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2be6525e3e1be793faa62db8b7716ff0/71115484431.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f0b1d035c6be28d5d52a8479f9e8cf03/71637551963.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/54569048056.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/punamefododujar.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e783c9dca3af229bf5dbb6d3c53a1bd6/nujivob.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3eb833ac3---28381400254.pdfIn PDF document text
    • http://fruitvita.com/files/files/67587999525.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15b387ab9---87738196674.pdfIn PDF document text
    • https://brs.jo/userfiles/files/15323095801.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/vawinobemusufatekipiru.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6117230A0AFDD.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_off00015274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15274 18428 bytes
SHA-256: f6212ede593cbba50c32896ae50612fbde8e670148d3ebc834f1ce90e98989e4
font_01_sfnt_off00018242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A59 10824 bytes
SHA-256: 9043202d96e9c528249dcc9befdf687aa285997568edbd618960117b6ea6b629

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