Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69a020f9192a491…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e6ee5f5b2b72db3b1dedd4f55824275 SHA-1: 9c8a7c737894ab609bcf3ec9de98c07122690911 SHA-256: e69a020f9192a491d984652603bc4128616060498b2eb52adcb7955cb76b6d37
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm used for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=imo+live+chat+4+apk+download PDF link annotation
    • http://hopkim.vn/upload/files/14137806134.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/41697004693.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94897674408.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6fb3756f31688cc0adef1b59163e833b/dozimezef.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/negevatatipenaf.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/42368640345.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/15003253118.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wiwowidokaxezizafawe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66772eeb3---9355594692.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zokutunubulasumufirugo.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/86878555270.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f11867c7---tomufaj.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/gusidigifuniwonadoruk.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/kiwetemivejowutatepatu.pdfIn PDF document text
    • http://e-sheremet.com/img/zegekaroroloregudi.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/17289986400.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4cfe3690b4cc5786e723af66e70004fa/vavibaludotafer.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230b5e6b4c---virozigoxokis.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kigukowedejatatalevorexon.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/denuxipuvadamitizarelobin.pdfIn PDF document text
    • http://ipublicity.cz/data/file/99745276683.pdfIn PDF document text
    • 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_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 19996 bytes
SHA-256: 554a1581f3395c9081548d6bc4417dcc0156279a1631c47781c76823b930911c
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10784 bytes
SHA-256: 667f46c3aff05010872e6cc451ba8a1209a28aba076097d42421020e4dd4ce28
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1