Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58c13bf06bb5b3a…

MALICIOUS

PDF

99.9 KB Created: 2021-09-04 07:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd23cdda28cd85df64ae4dd306047791 SHA-1: bbf5ec9838ada475954290fa97391eb062b26cfc SHA-256: a58c13bf06bb5b3ac98ff80ba568bb3c0cebcf7b4e5fd2282c23bf69ae375f29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://philabc.ru/uplcv?utm_term=computational+analysis+of+randomness+in+structural+mechanics+pdf PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce99280892f---girirawigelax.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5isjnpdp83pf5q7ik8tqf74gku/33658360340.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294255deea2---dimifit.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rabadixuz.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bukenolalupijidawisipono.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qoh582pc51r2nri46pvi2jmel2/51089969599.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c3a9c4b12d21a9b6150d981935e31785/tosikexurapumawogapofi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5996748e6a30ca3b0a09fb653916d62b/87135914845.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/17359587640.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210714_7C763F42B51E2217.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/80512728868.pdfIn PDF document text
    • http://yuhongzg.com/d/files/turunobaduxesuge.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/6bpur0ppkucnkvngrdo07g36as/xiwokenutowo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6a921a5b38f04c083e24b76fe20872b5/wixixejijipotat.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/57850361217.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117404fbcd71---saxegiga.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54318453936.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086acfc0c43a---memufuzizitikizorede.pdfIn PDF document text
    • http://agrion.org/upload/fichier/saweresejafid.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/bunadirinemodolinede.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160e02ba098c3b---28501494586.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/50v0b3hkmdrps8v220fqqqvku1/97597351424.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xevuwadiguz.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_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 11132 bytes
SHA-256: 1af94af9940821d8a41c0855db8d1149a9efaaeb921b1532d5e0176b463f4e6d
font_01_sfnt_off00013802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 19056 bytes
SHA-256: 252cd73bbaeeadf655a4f29c09485a2b310f18c82fb8581182d00a87392a0c53
font_02_sfnt_off000168af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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