Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acd939a8770ca60…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 05:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 17623acb486036e9d51b7b83e3398020 SHA-1: 19c10b5144054d3f4e207b4aa647ba724665b9c6 SHA-256: 7acd939a8770ca60f0a323784a874a67d233065c978d9090c6890ee8e9d9433e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://smidgel.ru/uplcv?utm_term=i+know+better+than+to+ever+call+you+mine PDF link annotation
    • http://budohurtsa.pl/userfiles/file/sofejilojepoweki.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/12158288006.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/duwuwe.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/79720244519.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rlqc5873dobb440nlc9vlm7qaf/45305931219.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/5455556970.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vutopebalijotivejisif.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2svnb6l7rfql7hme0s8ar04jt4/27360634467.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111e09bd2---70434296693.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/59709880037.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/91413674482.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/82920888405.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3dd113e94fcb424a7f19a21ad5da6b05/34629146009.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eecf09458---12836032777.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/44243618253.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/wifomabinipekawirepez.pdfIn PDF document text
    • http://kco.su/userfiles/file/39054694936.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567f41d5c6---36910704722.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/niwutidolojo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070adff39de1---9961748782.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088278e3f262---65665424785.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763fed5318d---50110189912.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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17360 bytes
SHA-256: fc53a66c0ca9d70611ca2000168bb7d13af4f44839b9815a3ebe2a53a4548447
font_01_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 10876 bytes
SHA-256: 0b457e031ee3cf6b61e85417f36e9f0055edaa029dd22cb8b034cf0b4b990b82

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