Malicious PDF — malware analysis report

Static analysis result for SHA-256 c219db0a4875954e…

MALICIOUS

PDF

103.5 KB Created: 2021-07-24 18:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40f53b23c1e7cc1ef04f3c913d398b34 SHA-1: c1371ba486606291877f69b13f26cdb78df32995 SHA-256: c219db0a4875954ecfcf26758870e905545063dda6bdb9dd1fdc378eb9aed02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm strategy. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://essuances.com/ckfinder/userfiles/files/97956357305.pdf In PDF document text
    • http://www.irrv.org/uploads/files/zetogafone.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210706_497E3965710FBEF9.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/nefinanurulu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c41d35d4f6e527e49355fdfc9026b3e4/28035374768.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/bumitaf.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/41792715864.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aec5d9d72---relumasuwuzazora.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/xokediweludifepukojebiw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e35971a1e---52286102575.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/33ma7erp18gnuo0b1ofngcqb4o/kemetenojebifapal.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8a088a6811f1c8bf9d3382c4c9275f1a/82932447114.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/27464827549.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070439420e05---24773857353.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/99547636705.pdfIn PDF document text
    • http://c-amc.com/upload/files/disebebisazetevesixebukex.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/84844610193.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/42180881972.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2d55e9c74d663f6bb60e98b3428e256c/21774267898.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/52728307582.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/81dbe2780efdd55a1e2829f9d18912f9/tilasuwerewevubutejuj.pdfIn PDF document text
    • http://hotstamping.pl/files/file/50383830049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=formula+de+productos+notables+binomio+al+cuboPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0aac7efde0d2c999791be50679f6ea3d/48309797772.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/19823606884.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 18332 bytes
SHA-256: 2af4843a441d52642e496677f1f60bff483512388e834b931e8ec84945d2e3fa
font_02_sfnt_off00015f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F21 10892 bytes
SHA-256: aff0de9e8ded91f0364580f3983ba9822b7aed2b4f1e3a4b5fc959afeb548a5f
font_03_sfnt_off00017809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17809 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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