Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd907b7f03942256…

MALICIOUS

PDF

88.0 KB Created: 2021-07-08 01:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b60da7d8dc3aaef4a266e616456a68c SHA-1: 84a807c50f118950f24183b6fba61a2e8397a18e SHA-256: cd907b7f03942256f89a558504f23b783891679a711893676e54865888b98990
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to manipulate search results or direct users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://learningsolution.ca/userfiles/files/sudalejufeforozo.pdf In PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/33137255704.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cca750a2b0f---fatubonixinid.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vc1v8qv5og2g96idtd01bqlqv1/jikaziweperogovozupal.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a881d7b9f52---40550807904.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b402c544a---mufupajivupila.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fc4b1eee---31631485026.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/62816604263.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/94351846337.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/gemetosotifamij.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4ic3qbedutq1t0k3sm8n01mr31/88017032621.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c61e241ac---13068167639.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848503a8f02---binetaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf789d938d---wobid.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/xidoz.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210625_93266DEA20979F1F.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160836e98a2282---wuzupegemaronevifot.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/94580205172.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/32481044281.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/17138689276.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/78672743186.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/4001090093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=someone+you+loved+fingerstyle+tabPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 17632 bytes
SHA-256: 478aee6b109fc714f4a1b1f8671f7f50a2b0ffe6cb2d2d37216cb59ede440b26
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 11192 bytes
SHA-256: 8d5934d5b42c9a777680ae939865c1210c5fa671dfab3550ecb224bac726abb7
font_03_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16392 bytes
SHA-256: 51bfd9de8ad86d1edbc37de8bd28f992f8b7a0909747c3be0a9bcd7d2f38554f

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