Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca7edfd7c4a6952…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 00:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db4394267a734c35a98a61f9b377c516 SHA-1: 707d1b88fc0a35c84f429654ad284f9aeedcaa20 SHA-256: 4ca7edfd7c4a6952c84942d16f8ce409b8ac8a894494d89d893372eb6e0f2df6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a campaign to leverage SEO and compromised infrastructure for distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=sansco+cctv+installation+manual PDF link annotation
    • http://italianopizzeria-pg.com/uploads/files/tebop.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/17899466965.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88231cae62---17741310152.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zakerefuna.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea13d40e2bcda59aea258bd31527394a/pategi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a413ddb3b---14452482824.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c11e75a7---dagisazaforukafopesu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopefeweveposuzone.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4sk1ntl7tfh3tmjarqcdnngsd0/9464061418.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce6528c9d0---87476205532.pdfIn PDF document text
    • https://eternalbliss.net/file/20586439551.pdfIn PDF document text
    • http://kasargod.net/uploads/file/42970495068.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bq1bgq509veegl33lv0fpmlksl/kifevisanewidezavape.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/takijesopuvuxekurame.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b732a83e2c6---48176086895.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/87918090430.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2a330baf---kegelotagekugubasi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f55ffab8cff---gixotiwibejanin.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///pasefenewabuni.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/duteliwetojod.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/6764320380.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aapp29mb9g4mor4s2gos8rflu7/47370433741.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/52496590130.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_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 10400 bytes
SHA-256: 62868b2987febfdb5a5e8ee1a13733cfb88d0db2337ed7b8ce7eac9904372cbe
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 17104 bytes
SHA-256: 4180a94580750ce82b8820ba161ccdae110b1c9b00de94084fb097344aa8dffc
font_02_sfnt_off00013e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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