Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3f1a317d2ff3d6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 22:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c9772848901fe65b42545ec22efbc02 SHA-1: 4cc698cee68491e95c5ea425122cf63756b44f44 SHA-256: 2c3f1a317d2ff3d664e65f132a78dd3a2bb45a409a47056f0385d4ee9c4b8057
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites, suggesting it is part of a phishing campaign. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=pm+kisan+kannada+form+pdf+download PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/51d3720140646c2750f870389603100c/97667443701.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/2abc891a152dafb3aafa022c079a2776/67682972944.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ofi14mmiv46fpfasrhvl552gjo/fomokivo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63516176863.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9b9d8c124a4fb9d9a2b460a2221c171/ramin.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/sqv8lu0badr630olvli5oc32me/23353387928.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb18e8be6c0---fisixemifivinufagiraba.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/kapam.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/4360970554.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/97214721329.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/24377306549.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aaa3659e6---73475182222.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b160f3bcb04---pujizipafarimotiseru.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgiac86q5csbq3flqklkcfg3r7/80329217222.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/17302147861.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/91828168732.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/43681956714.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52be418b6---lazisuvenuki.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/vasaromuralumowoge.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/78285292104.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f699f4f451---gigudejorup.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzubudakuvines.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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 10608 bytes
SHA-256: 5f0f227573d456ff2461718ccb1758a2d88aae51f3db49f690a72845fab546d9
font_01_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 22748 bytes
SHA-256: e5eb08b2edac856aac249c158df4b02fe5ce39f4762144dead3c63319c2a3a4f
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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