Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c14995dd7d7913…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 22:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a168c7fe4890e5a2115667a7f20469c SHA-1: 7d0becfcd3252ba001a3d20657ec15c98234fae2 SHA-256: 73c14995dd7d7913e9586b3cf19c55336bcbe2cfd855292b58716f8ccbc883fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=sarge%27s+heroes+n64+rom
    • http://odontoflash.eu/userfiles/files/puzakumetibuwi.pdf
    • https://kiofruits.com/admin/uploads/files/58911677218.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/revavovozetiwitaxuk.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie7ngrj5ps16bcemtoj3ef1984/76344116366.pdf
    • http://nanumed.ro/uploads/files/xofagejagugenujobafa.pdf
    • http://nhasachconggiao.com/luutru/files/fovijedowirodelogavokeg.pdf
    • https://bearings.vn/images/ckeditor/files/ninubafufebukefofawidem.pdf
    • http://altronic.pl/!mag2011/userfiles/file/31148040464.pdf
    • http://nissanotogovap.com/uploads/images/files/63846984010.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84fb07c2---64285647322.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e331d064---81791055697.pdf
    • http://bienbao.org/uploads/files/safokabadasobutegiwomev.pdf
    • https://listapp.in/ci/userfiles/files/wifejixibobazonobakemezo.pdf
    • https://saikekanglun.com/filespath/files/20210907030035.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sa7po7molfopke167p0j708d10/maduzitobupunasogisiser.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/42524335112.pdf
    • https://transmar.biz/ckfinder/userfiles/files/47410883778.pdf
    • http://mamaskitchenorder.com/uploads/files/14270354772.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gsn6it1sr872bl2e0ajdq1df16/kakigulezu.pdf
    • http://mynigaoe.com/upload/file/20210904090950.pdf
    • http://bearings-home.com/userfiles/file/30676641290.pdf
    • https://whitepalacegrill.com/userfiles/jitiraxudakatu.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/fezujotukotujebef.pdf
    • http://uk-finansist.ru/userfiles/file/gavijorogavivogape.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_off0000d150.bin
3f6cae3891beb5527fa871d8b68f47f4cd1475ebedb36169a45e11c063f8ecd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 10672 bytes
font_01_sfnt_off0000e9a2.bin
f73317b0201fea5122d24dca4bcfa80c1af6006566da5509a5e038528b68b8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 17820 bytes
font_02_sfnt_off000117eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes