Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a19f47e9bb57e37…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 20:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e029197d73f608e50a0d429ef6f3d34 SHA-1: 5a12109fc97ea9e5c97fb09203a42817f321bca3 SHA-256: 0a19f47e9bb57e376c26cd6f9a3955b3f18b76a777508b41d3c23dbdbf44f9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=good+adjectives+that+start+with+k
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee157de953---93229236497.pdf
    • http://smenergy.kr/uploaded/file/9823895076142890cbb395.pdf
    • http://teplorium.su/userfiles/file/lawatenazeg.pdf
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/wadufutisasazarulofizije.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c034fbf6e0a27467a061506acd8595ae/fivemer.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/96890487926.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/tawumovebolamekoxoderoba.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/boxejepeduzidataxavekog.pdf
    • http://soc-in.com/data/media/files/boginefezewenekaloradoke.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/l1i7rm7k19t9jclbfn2sdeu9tqit8lqc/68786417880.pdf
    • http://demkapi.com/resimler/files/jukexufazejujereza.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/fuxaros.pdf
    • http://prochem.vn/images/uploads/files/1912618761.pdf
    • http://wakesup.org/userfiles/file/tikugalarowasumugosu.pdf
    • https://patc.fr/imagesfile/49323379669.pdf
    • http://art-ball.net/files/file/3600178846.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/859685eb98db1028544ebdd6a1165d81/jidef.pdf
    • http://syntra.pl/userfiles/file/46881896379.pdf
    • http://lachina.cn/upload/file/fanususitizufanisuvugu.pdf
    • http://kleinschaden-expert.de/userfiles/file/86668713292.pdf
    • https://ksdc.in/userfiles/file/wosodimumexar.pdf
    • https://desense.eu/uploads/wysiwyg/files/31281625367.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/41ce2f4a2eaaf4a85567018e1d64022d/7658087179.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd0acf9df---17079954153.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161442d22b47af---tavodidekavopowizazepore.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_off0000df5b.bin
a927244e9a46549d3e33f138ad71630fcf267c2b9bca0cf38d8995aa8b018927
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 17340 bytes
font_01_sfnt_off00010b48.bin
64ec1353b6e9e28ea4680aa310dc1685eec4e78f52e5bf690f4a95f2b2107719
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10728 bytes
font_02_sfnt_off0001242c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes