Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cb7fbedcc4dd1a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 03:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a744168f4b935a1f0584bcb6480bd7b3 SHA-1: abebbeff2cf45a400a6b9ef37b25e22d43bd6577 SHA-256: 71cb7fbedcc4dd1a9f99cfe49fa3a52f779f93d469e9607feec8588cfccc55d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://tlumacz-lipno.pl/pdrzewiecki/files/mugosemoguwisojozaju.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ad1f6df47999b7e84b3c59ada43d80e9/64582914972.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/1861203335.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vh9muivteothlvfvdbspr0diae/fimujumofitoredufa.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/saxifalosataku.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/boset.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6867b5314---gebix.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8da1e896a---39885382259.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bbeb642e---dugarekufuvide.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/85e4ec49667e0542f6d5ff6484c0ce7d.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4fcc62a0a38a84a7487c353816c9b3d6/96630691602.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3e0419d392641fad92ad13d3269f6927/daxukapubipoxowapurag.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6145ad72d8---mumitonugopunedomokaruf.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kupopamumubitaj.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/28584068820.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/76196888152.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0fvp9asfnuu4rsi9pcmcdfloh1/duxifimakiviva.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/10496510920.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gfcr56657fasneqiavfls6qluj/kefozobajigeduwedofi.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/topap.pdfIn PDF document text
    • http://synphabase.ch/upload/file/bamezeduferon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=oathbringer+filetype+pdfPDF link annotation
    • 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_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 17660 bytes
SHA-256: 6130ceab20c927ef3af7bd9702e3c602821a241b9ac47bbc79559c15f0ed86ab
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10768 bytes
SHA-256: b378d85cb4152be62c1ef44c62b87f1c2a7537954d8a18a0f50eb5c02b21ac4c
font_02_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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