Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36a06710dbc4cda…

MALICIOUS

PDF

87.4 KB Created: 2021-08-03 04:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5baa0d811c344ec0c258e656c5e224c1 SHA-1: 406efc6496e66fa2ac6d3bcab48150cbd658ec16 SHA-256: c36a06710dbc4cda1eee2995abfc1d34e49190c9286637d2407b2dc30e04bb8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://sportsht.com/userfiles/file/85486813350.pdf
    • http://tulga.ru/editor/files/tebigimulugetub.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/piguref.pdf
    • http://almawred-sy.com/files/adminfiles/files/47775993405.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ad5d98edb4988f018454c5e3ba64edde/mafigeripafofuzuligejaw.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ka0e9p3bp9gmbsdap2u5nhctb5/naxusefekuraribujet.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/697932189i0b4uc1k00dq43m5v/22758636219.pdf
    • http://agiusfuneraldirectors.com/files/file/98669618454.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/17702506546.pdf
    • http://wildpflanzen-planung.de/file/farupusif.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/793746cc82abaff11326598ac41e6706/11656034535.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e823dcbc---79280640510.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3adu9afok12lttpk311q4p86pg/rilonifuvozikerezaluz.pdf
    • https://people11people.gr/uploads/File/29601896850.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/82d93e3f01cf5feb045c01709a28ff62/baremunu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072adc848d68---96112765935.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b38185d64e7---vakavapupenavepasunevewig.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ca15978b---biwizowume.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210720_D1C7921800DA3F2E.pdf
    • http://ck-tct.ru/userfiles/file/78186858560.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f4eb5c8---gofazopusogoxexore.pdf
    • http://cc-loges.com/uploads/file/wufumosubokuzojoluzoj.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160942fb27a8ab---wasibuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=varicocele+treatment+without+surgery+in+kerala
    • 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_off0000f147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 16792 bytes
font_01_sfnt_off00010959.bin
214e1d342a7611eeba74fea168f81454883b69a046cd4983582771a65920c112
pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 16792 bytes
font_02_sfnt_off000134ff.bin
8351183f53055ba5980314b47795dcae1595ed1adb0a7393962f97e738047a64
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 11040 bytes