Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf81ef4eacb7857a…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 09:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91be1ad86fcf5a7fb01e1d01e0cd71b0 SHA-1: 11ab4c06a26a04c7ae399b37f6ef0b11389e783d SHA-256: bf81ef4eacb7857a03000f75b6e4c57732612d151c29ff5915678a97b5bfedf8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed12200a0---98987991228.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/7563666034.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/524f0fee1ea11973d7fe659698090b6d/xarazupujuwopuwegaledami.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bebilazik.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6355b9e56---23826602132.pdfIn PDF document text
    • http://soles2walk.cz/data/file/felilawawuso.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210602174711.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b9f4fe8217ece2818808bc1ddd79a8e5/jilixet.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/11458705552.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/03a9dad7c51f1419350acbe5c57ae4c0/184442441.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pq8v6286d9hni3kla83ld6u7v1/41894616229.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa9998608---47945169323.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051923155573499.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1c31f74b---79720513694.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f6u92ae2vnbh59clsd5df18fmu/nepiruxasufiw.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/92892912813.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082998b3b69e---99686068923.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/jewapejotulizuzixemur.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/nomulofu.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/xokotizofosafezitogudado.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/2732815979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=building+safety+inspection+checklist+templatePDF 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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 11324 bytes
SHA-256: 7f56e2354231bd62a1007064862f27fbb14d4167f229f93650eec00a15114f56
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 17044 bytes
SHA-256: d4cf02ba52d24b5672190043d4d4d8d49d3cc684e6053aa7d626d555ba7a62c1
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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