Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bd759b59aa3797…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 993b3d32fe2fb38172a9fe5107979220 SHA-1: 16ea01e7890232c01f9e04dffa63dd2c2c4d3ef2 SHA-256: d3bd759b59aa379761425e68995fe41f590bb019a203d0849fbcd39153d51b3b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure points to a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://deltarents.com/upload/ckfinder/files/mitamozakoxedez.pdf
    • https://art4you.sk/editor_uploads/system/files/kutif.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0491452d2d6b0980a495dd0efacb90c3/21321236758.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c120e78c989fbf785260c1c10f323922/pukizoliso.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5550a4c099de7d60dbf26a020351da88/liberuletapozawaravomuj.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a99e04d59---najegajutazelaw.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9cf9797438374477af230d6b52353283/38479995747.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1beeaa357602e8da9355ca2a0e5ddf8d/gupowuserosezek.pdf
    • https://chp-travel.ir/data/file/84496999098.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69bb56d607---pirunezek.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/60014375855.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7d41c369---23169010662.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5c3b110f---17879931651.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ad45a7ca37a---rulupikude.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/xexetiwu.pdf
    • https://ktmcollege.org/public_html/userfiles/file/41404686819.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3db4d4c835bf2e9973fc97ba87f1cdd5/virerorinegigaz.pdf
    • http://biomisszio.hu/tmp/vafupizifudunonaporasefop.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/kovelubalup.pdf
    • http://altaprecision.com/userfiles/file/6196869711.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160899b08d3b26---lulelamij.pdf
    • http://premium-h.info/files/files/67888832271.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/nevoduligu.pdf
    • http://architetturaurbanistica.it/userfiles/files/dupiwetaritisifopefajeme.pdf
    • https://tyeetomsfishing.com/userfiles/file/98303388871.pdf
    • http://pelesiuvalymas.lt/i/File/66368321282.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sql+statement+order+by
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
font_01_sfnt_off0000f678.bin
8c96dee7034b3ff123bea0e43e4c85d11ae0b23f5bbcb884da5cfc72d38fa594
pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10792 bytes
font_02_sfnt_off00010f22.bin
7252a568ec8cc657c99315cff4afd36513b204fa1161550e0e1d2fc2dabaa856
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 22708 bytes