Malicious PDF — malware analysis report

Static analysis result for SHA-256 598b820f1918ccfc…

MALICIOUS

PDF

86.1 KB Created: 2021-07-18 08:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a58e1b4512e653d4159b1b8dc8ddc540 SHA-1: 4c9534c2a243bded09b45848d39c0b86608a918b SHA-256: 598b820f1918ccfc77eb2b754ac598c2a3452508ea7c808146f633ca35cc35f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for SEO manipulation or to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, providing no direct textual clues about its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748994dee6---52312481474.pdf In PDF document text
    • https://duproject.com/uploadEditor/files/36768880202.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/28673056639.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b019bab37ae24d05224829ff41e62b44/13402285909.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4a5a90295db154f233be5a8dc377fe5d/57920251973.pdfIn PDF document text
    • http://foodchemsino.com/d/files/resela.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6dc5b0b261b50d4d67f6feff1dae378a/famukezife.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e4d36800---31518443632.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/79883614545.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/vshgm8n60it8uh2j037ocvc76r/34594826661.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08fef77ca9---tiwokidixu.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/91008385052.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/mekovozalaw.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2aca477f---xasuseruwizodajob.pdfIn PDF document text
    • http://ubest.ru/images/file/99946330985.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zepotumaxexurevusiwavakuv.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/jejazosunukowuv.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079473381750---71637193004.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/03/48788767788.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/9659573428.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/luwodi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/53545420037.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8ai8r4dje4kaa6e4a92ikf8ipm/94364789332.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f165f870be5040232772aa8d24fb2762/86576971146.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4f47cf8e---dejagadelopifir.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/nalawataxitefunosoxigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apple+itunes+for+chrome+osPDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10664 bytes
SHA-256: 5debb03a36ca7731b2af55256fc2f87ac5a6efaa52d8944960842ce5b36ec8e0
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16888 bytes
SHA-256: 18387bb0b3802e602f1a88cf23cd5bf1184316a711408c69a83012106bef5f19
font_02_sfnt_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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