Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1be1c6c7db1bafe…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 04:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ddd8a41f3accc65687d53aaaf2393c5f SHA-1: ace4d48b94a6039e12e62fbef014d65ea01c405e SHA-256: d1be1c6c7db1bafe1b4814727c8f5cc1e6c1a7aae97ed294628178251b794801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. No scripts were extracted, but the overall structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://infrive.ru/uplcv?utm_term=cam+11+test+1+reading+answers PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a36b37e0a7f8b59d6d9e7c78226824b9/33956730361.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a08c5cc2a---83478732914.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/befelud.pdfIn PDF document text
    • http://airsoft1.ro/files/file/rilovelivuwof.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c366302826b---wenikaxokarupujotusudu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ded0337479---34224555503.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/38621439533.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/19900778109.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b25512978e9---zeraxukipaxodinejarutelig.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/vutijopewagiworaretek.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f3b1b4b0---64616625470.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/ruwumezevaluf.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0701835001624045587.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/0d124e72b0a229adea142bae89ca4184/8801353158.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a938b0fe0a64fa2767af9c9f4f8da4a3/sasusakovajum.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4111cb0e2e258e72aa7c20c6d3ce08ed/ritenima.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c67308cc53a---60312537880.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c241b5f70b---23477003378.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/18107331244.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0176ac69d3---84981360214.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a18f58b19---bujetiterepigotesawexu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/18376376327.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/dopabivesusinaladaxijef.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091778fb2935---denopadetuzumume.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/10463138497.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/wipikajevoz.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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10592 bytes
SHA-256: a681e764964148497e1f03cdec8a757e7194bcf7c79f26c00ada4642d70fb797
font_01_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 17888 bytes
SHA-256: 714fe706a2ab9bc64d274d7ea0b688f329c4a378a23b4e3fb95ffad300a0457a

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