Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ffa125a06b6178…

MALICIOUS

PDF

121.4 KB Created: 2021-07-13 21:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d2f19211b5c5cd8aa878001391c8d41 SHA-1: 578d9fd5b8decae4d4a27f3c2b320f9d335426e2 SHA-256: c0ffa125a06b61785271b89e5f1d6d7d9f29a4ae69a6186a08621bc429b49073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links is a primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=what%27s+haploid+and+diploid PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14c69e7b83b1ca31f4e50531a1d5bfd1/94502158996.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5e1650490cadfc8bde7e8f2464a17e92/33152472778.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a5b0d71e9---xiwagiriwofeje.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/segikagabazufa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/15990293018.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216302113166976.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0b436c721a58dd20899c9728798f6a72/gipobeluluxefexu.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wijiralu.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/zafagezovapanuvivezavol.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca6e2a9bd---pirubemiwedik.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/motijirima.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/bezizaluxeduterovatixul.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081da4649663---74085236192.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/24462041352.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/15147960962.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/46778524993.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/bofapabuwi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e2ef623a572cb7a96b037a3627832d5c/43866139223.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0669f26b3---92981979311.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00bebdf97---77770876632.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_off00017173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17173 22016 bytes
SHA-256: b9c38222c931ad22aace53454efb3c459e4e1abb907fd3de4db37386216b909f
font_01_sfnt_off0001a95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A95C 10284 bytes
SHA-256: cdd7fcd02cc43d6ba22ea011031766c45556e4a57c2cdf2d6c793ffc6be3e1f6
font_02_sfnt_off0001c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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