Malicious PDF — malware analysis report

Static analysis result for SHA-256 4095734b02b60d88…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 14:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9065cb5e9df1ab0c2da82744d623cc66 SHA-1: e0ac1f8add924bd29a764405d9105ae2d459a5d0 SHA-256: 4095734b02b60d882c109b50b1e6b25442f9198d26e9603e97692f92afcec09b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the overall heuristic firings indicate a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://alliance-ltd.com/userfiles/56328249301.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608764175ffce---sukowudez.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210826165820.pdfIn PDF document text
    • https://educhina.mn/editor/files/xapizajurikarafiwomidugi.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/55713582860.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7231d391---98480368131.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609251df01bc7---kevijoxumorezixal.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/95842280866.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/92734435115.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/puwililofile.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/pinabifajibisonamog.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608397c535450---65166792441.pdfIn PDF document text
    • http://fitviewer.biz/files/file/28182021982.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/putuji.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rejuzoge.pdfIn PDF document text
    • http://abwessex.com/uploads/files/nokob.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec93f47eab---puwutapusesimatimawotegim.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/72212798590.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b9be9510---89037665943.pdfIn PDF document text
    • https://coil.hk/upload/files/ludasomuzog.pdfIn PDF document text
    • https://fishuntpesca.it/file/62657690347.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/50648864970.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/42j0cj82lir6red9a6b6a261d4/3653286920.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/9126466083.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/67887219312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kashmir+history+in+telugu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 23036 bytes
SHA-256: c1b354e16b0767fc67e42ee80344efae683a2f939de1a74e8f77c5be1df871fb
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 11152 bytes
SHA-256: cfba4439859decdd48945b590ed9f8c21f2700bb1fe54d023bebbdf78f6a3f1c
font_03_sfnt_off00014bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEF 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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