Malicious PDF — malware analysis report

Static analysis result for SHA-256 28957d9eabac2bf2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 09:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 982690e4af26bf9261749cd78f6a76c5 SHA-1: a9d3fefb2007adcca17f1f669b6c576bc310ad4f SHA-256: 28957d9eabac2bf2cd93c44d479b31cc517337e973e1e0844852e711116ccb4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=socialismo+y+comunismo+diferencias+pdf PDF link annotation
    • http://adbrf.com/files/fckeditor/file/159451318360f9943e4fbfa.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/47206275085.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/newenamukobake.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/77077210786.pdfIn PDF document text
    • http://c-amc.com/upload/files/72138684426.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/27932881483.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/85636797554.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/levusedowowupelupi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f6666bebab7d34da7c657cfb7236dcf3/34923715197.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160767f3eafabd---95170305624.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/lunebudaga.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/04/62565800869.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f0cace0a---94820319137.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/2109262662.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/95231815509.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/83678884685.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa594487e0---22908949471.pdfIn PDF document text
    • https://kimansion.com/uploads/file/31037250030.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/35625123041.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce35c9---56749131255.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b4c65d4eff445215cc509b8ac26f2acc/79065222213.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8ab651a4---33805089247.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ffdfca8bfac03f8c508b781a29a43f1a/piwafe.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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 20292 bytes
SHA-256: 5fa71a7edf70641c3ff27ca0a51b77a12d83253ca9cacc562468ace0e81b040c
font_01_sfnt_off000115ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 10972 bytes
SHA-256: 912711a5defa51dfffe0410a6b2a5a3b061947148004905b55297a867d52d7d7

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