Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8742f86eaef9782…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 01:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b60c3dee41e9a2da6a1beb0cea0d853 SHA-1: 8261218ff7c63c72dee07fededb6b200d5f8fd8b SHA-256: a8742f86eaef97821befec34c26022e8fe16d783af0d62e17008a89fb2ff4e0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged 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 disposable or compromised domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious content or phishing lures. No scripts were extracted, but the structure and URL distribution strongly suggest it's a component of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=yify+after+we+collided PDF link annotation
    • http://suaups.net/userfiles/file/43502475272.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/62266804532.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i30v79f7r07vpbqflmkifg1m90/28000688236.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/19438709531.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/12892538097.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/bupulodexuvadule.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/funasujataserige.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/86901570931.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/ganafasolivotofesu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7e1fb216916354e4997b0e538b344aa0/34789815700.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/posurepexusu.pdfIn PDF document text
    • http://com123.vn/uploads/file/24014848633.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/ketudulid.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d88e39f73e7d724ae87d64f8a6797a5d/juvunakibojipezodase.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/88827281383.pdfIn PDF document text
    • http://viettruss.com/upload/file/36942358618.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161339b70ab2b8---kiribefi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/ziwagoduza.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xejegiwezijirudata.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fejiwatipozo.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/savuwanorubufudufo.pdfIn PDF document text
    • http://climtech.com/files/files/rafalivobigizageke.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210915202215_pvsxkn.pdfIn PDF document text
    • http://vlajamo.cz/images/file/76132541.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_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 10380 bytes
SHA-256: aa3bb22a4bd12622f0c8462cd961434532640219784171b91ccce3d93ec81b74
font_01_sfnt_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 16652 bytes
SHA-256: 6505df74dfa6aa21ade46cffde8826a1e821017fd959bb54ab0e783b0a5c883e

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