Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62a6c797e4eba90…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 15:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1377ce2c47a85a08822cf143344481f4 SHA-1: ec19569c4fdea4ad8f2199b81a501402dc1de811 SHA-256: e62a6c797e4eba90406e1bf19a305248a565b1629b29d9c1f79cc5da540aac33
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of 'utm_term' in one URL suggests tracking or redirection, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=russian+army+ranks+ww2 PDF link annotation
    • http://pomodorolennep.de/gfx/userfiles/files/59602119923.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/57182392887.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/13718804368.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zoxofegijaj.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/digetofelevidopeledowur.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/48466999113.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/6260306199.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/wobejiti.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/pesevesop.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/kuradidakixisigosakize.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/mokiluvitizabukosadarofad.pdfIn PDF document text
    • http://sjhtractor.com/d/files/15663733376.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/44500091147.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/futosenoramosotodatu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89ea2a30---vezasatow.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/meenbf1geuddksvhq8nea3c4m6/30608712468.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/bewugowadu.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/kirabegujinira.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/91718483890.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/keberigizixajurofejumufal.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/40639580432.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210905_A4F93AD19E918D47.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f38583494---parasejonetove.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/lopuvinagika.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/82299923201.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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 18444 bytes
SHA-256: 10f7bf97a6758e6681b1e71dcb541161f13cacd4eced86cae75c1fed1d01a927
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 10432 bytes
SHA-256: ac4f395a919358810335b3ef0f4b17d4f6a852069d6209eeef4d4aa1b33c4714