Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5c4aa93356e2a6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 06:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d65561e51a59438028a9f8702de153b4 SHA-1: 81c5793a71d982e200a6832c78fca8e43236788e SHA-256: 0f5c4aa93356e2a602e5f5e9f457a3ad3aa6c02e8581bf9ab7dbfab55806bf41
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=dickens+court+margate PDF link annotation
    • https://bloomeng.com/uploads/62519444269.pdfIn PDF document text
    • http://rc-modeller.se/images/file///5652643200.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/99513225031.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210607071531_kc8gnk.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/50612957811.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cet1ok2d4vo7pfb7ltfm3f70u0/40277391694.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd5158caf6---90628301659.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a612b544c32---xalujumugejalanivopax.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa403ed77e2---fuwonogaxebetofanoka.pdfIn PDF document text
    • http://jump360.co/upload/files/20210612104852.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/88635978813.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/gusudizefatinusizavuzuwo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b0d0d5781d2f622894689d3795604cfb/15900798108.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0787e4807---31857562592.pdfIn PDF document text
    • https://la-klamm.org/Files/files/sozometukifajoxoxavu.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/17553475958.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a65365f7---99856686136.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/givepifutofaxenuvosulivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95281dd287---59072020563.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108a381ec945---safaxujanologawuranoz.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/57892642001.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2609f6515051c101242e871429227dfb/rotuzamomiji.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/57319259034.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 18236 bytes
SHA-256: 5ade2e70cc810c6b2b4a0af00503fa8f21597aba77d48076c14d352f0e5944e1
font_01_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 10720 bytes
SHA-256: 729c6f940851589d58172a0e1c303a3e235906d3173b6353c0ddd15b6e74c4a3

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