Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3d45e908a7b376…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 01:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9dbc547a18f9ee4889c719ce02a78fd SHA-1: 4cc3ce9f422f24a34f58e7ecf1f58ae4d2ef0b70 SHA-256: 1f3d45e908a7b376b5fc9f6ec4a7e08db2cb9f2cf2eccb75048c0217e24e378b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing pages. While no scripts were directly extracted, the nature of the links and the detection indicate a likely attempt to lure users to malicious sites, possibly via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caa981bfa---rojobigojal.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tvvuve3ts3inu07iooabn9ig36/tusomusunisev.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/755a7591a721e655403bb22363550c21/paxemufoju.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c16f0539---27190492745.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/xefabokazodesam.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/543af59360cd6b5cd59d0eca185c1644/kagofemefepo.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/45070226125.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/71906248924.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/xosafipepe.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b218f97ff9516543152f910815f7a4e8/10459591474.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1d75aee8---3424628229.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce713c670---14582746461.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba176a8188---debavupanoreraju.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/acf154e7903efade4046fe199a8a830b/64434312681.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ea4ddf4---76736451374.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/62210164237.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/48994825197.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/biduritazefopafinog.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/fokugatewi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f22beafedc---muzabosejimadaloba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=python+regular+expression+cheat+sheet+pdfPDF 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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 11216 bytes
SHA-256: d0aa0f20ac061e0fe180dc0ec8fef44128f56201a1b5b9b010df1283b5fa9325
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 18892 bytes
SHA-256: cd7fc8f42d67bcf9b82067471e02c0f396365586f11c926700097a389de87892

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