Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4e59f7d97ac669…

MALICIOUS

PDF

97.0 KB Created: 2021-09-02 12:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d74b3e3cce71c9810dd9bd2f67410c75 SHA-1: aa4119d2ef6286180ef411baaba345660f9057c1 SHA-256: 6c4e59f7d97ac669424e7655942101c90174e1ef1dd0abf4e3c5ef4e091a139e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://1hozain.ru/files/userfiles/files/40524230113.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f834f83e---41929880277.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/sojodinijekite.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/14690634467.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/webid.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/weburuj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4fac57b7af4f17e760975de899238670/46189072506.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f5402df674f8c9c4ee602a825e09d652/jidinarigemafijupavu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/h1iu5lkpgn8tlt4n0esn656ts2/50566278969.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/26858951062.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/zabisatibudelolirafi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624257359dapafukuwose.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kunudofikiw.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/91614323981.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/dexubivepevokobuwi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/55390934829.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/limetenijudiwit.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/27433634189.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090122275473499.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/loxokiroxoruwerawopatojo.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/18386630682.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608332859c773---95070650131.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/37672169100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frigidaire+dishwasher+model+ffbd2411ns0a+manualPDF 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_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 11376 bytes
SHA-256: c9f20bc666e21c1cc9afea85b9da4ac699e0c9a8fc5d94e66fd0bd60035c90fa
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 19440 bytes
SHA-256: 386eec0a67855ddfc549daa1afa7957e87df326a578d5dc07ca16ebb990fcf28

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