Malicious PDF — malware analysis report

Static analysis result for SHA-256 838331d8b495df27…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 02:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b66b489440c24161fdbb4bcb0512f312 SHA-1: ff21bdeafad6abf2cd85354f63872f1a7e97bc5d SHA-256: 838331d8b495df270baa0bcd4d2a6ae530d278bbcb2132b94b18bd822474c171
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=propranolol+and+paxil
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/kelokixanomutuxizidadi.pdf
    • https://mimpiindah1.com/contents//files/22265264255.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5932c1312f---99200678199.pdf
    • http://stellamaris.cz/userfiles/45358070958.pdf
    • http://ukuleleceilidh.ca/clients/860383/File/67238714861.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/58736298078.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/pipagizonamasopamokakepit.pdf
    • http://budohurtsa.pl/userfiles/file/24347538011.pdf
    • https://bawwabatrizq.com/userfiles/file/kimitaruvagamazoravagenu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f342dba07---rozit.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd572f7b1b8195b3404fdee33e872b/40424887322.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4ijfejkm3juk1nbtpg8rfrej8c/8082668992.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb3f5d573---30606071250.pdf
    • http://aceranalitik.com/ckfinder/userfiles/files/vekagowuvuvefejegedojavi.pdf
    • http://golden-candies.ru/webroot/files/files/59398137322.pdf
    • http://www.look4job.gr/images/_user_na/file/kikenal.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/caee6f95ebc6973523c9db7a6be3bfa5/86946052806.pdf
    • http://www.kickcommerce.com/userfiles/file/gexiw.pdf
    • http://eko-gospodarstwo.eu/files/file/tomunugexekowobuzefewido.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a35ec982cc3ae0f36c42fe2d7171354/xopuxenasakubonezopik.pdf
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/kudekuzefu.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fc1145fdf88381639be6c6b37b411f73/nudesizikowet.pdf
    • http://ping-property.com/user_img/files/41602798971.pdf
    • http://au-zlato.sk/upload/files/serepomemedumam.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bc55b875---16040342577.pdf
    • 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_off0000e59d.bin
7dddc47c29e752e802e7c3bd1610a2e3a96d8475aacb6673b6fd373138608140
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10092 bytes
font_01_sfnt_off0000fc18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
font_02_sfnt_off0001142a.bin
b28280cae06ed64a01a776b858ba6cbdddd2b1fdf7aaea5b1491f77c00f28e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 17336 bytes