Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1795074e8eb976d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-03 19:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2e7e71db7ed9be04274aa19d6fbbbbd SHA-1: 74ecc80de02ccdafbc9e785aac560c588e2774dd SHA-256: b1795074e8eb976d8c289769c3f176560ccd47f5021c670df00133eae452e7e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure are indicative of an attempt to lure users to malicious sites.

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://laborke.ru/uplcv?utm_term=john+deere+425+54+inch+mower+deck+belt+replacement PDF link annotation
    • https://hijaulumut.com/contents//files/67243447653.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/13332038165.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210704_D3E399FA9DE95501.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/fafal.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/tawevipa.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d612f1453f---40149106523.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rqtu2ijrqn5jf4iddkt35h4454/xijosizu.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/85732448154.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d72500b6fe6460683c772c08a0ccdff0/lobujiratip.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c7d27dd33fbe3d61345e6addf4d59f58/kelebejojigonopodiwupebip.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bf8729b4488be390f18445f9466f56fd/79348506478.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/580f1befb39184c9a31a4223ce4ece51/niwenijuwejomafag.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xibinuvizosiwepajidojusa.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/waxurobejipapexifekowo.pdfIn PDF document text
    • http://labradory.pl/file/sojak.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963e3f87f08---48989856633.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/6889234469.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608347403c421---nixaxibolanewopivi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d93475b37---jijasavemipikewenoronixo.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608377433cbc6---rafubugokikuvarapeverep.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/kawegawodixoneraxenivijux.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 17324 bytes
SHA-256: a0893508cd2e3a20c25bd0f22e577f04ec740b23c10ecbdad38f9e873ba003db
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 11252 bytes
SHA-256: 7f138e30a914f86b35541c6c40e248615af97f55319b9462bedda37137d0b85a

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