Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2fed47a3624727…

MALICIOUS

PDF

91.4 KB Created: 2021-08-23 18:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d994258480484d0753029929263ea760 SHA-1: d546dfa960cd9f97cc26f04e81f7d37c65b9a1ed SHA-256: bb2fed47a3624727e6dcf9100547317b4803bd0a57da851475d4392239aea7d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mirrorlink.com/public/files/files/badinobirepidivivi.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bhtjma4pbm73kb909r67mcld81/15368242137.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/57011759090.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/53210763195.pdfPDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3a483e68c30d68154ec360c901b15737/85972710664.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tutivotoruwobinufulej.pdfIn PDF document text
    • https://svltv.in/userfiles/files/47499633520.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a5i46aibp00i0nkic26bf44qt8/kuvefuxi.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/59212999004.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22c8944be---setudisile.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/44300604522.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nd98gqsq3k517bmc75gm3rhtrk/83748677764.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/fubokes.pdfIn PDF document text
    • http://benly-carson.com/product/files/93995486759.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a4a99c308c9e910f69b1dfa29fa413c5/nosefuwakomebiwafok.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afq8fmbdi2o6mv9ckeqf83qsqn/66146241693.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/vutedaxagunukatawaf.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/mudidimo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/5dd6f2eaa62cbfe80a528781f371c34f/53063691116.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0f91d32abc50fe1a386d74fdea0fa0c2/53341815108.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6cfb5191011b3a280405ecd85f78086/letim.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/teboni.pdfIn PDF document text
    • https://actor-conseil.com/files/file/nofimajudusapesidefuxuz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724e8dbe49c---wozivabole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=planting+potatoes+in+winterPDF link annotation
    • 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_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 10512 bytes
SHA-256: 538ba69c3bd45089fb67481e1ae1b6df8fd4888ce6ec593ead1aeea917a66b10
font_02_sfnt_off00013279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13279 17456 bytes
SHA-256: 490749196822181cd2b1c03285e828f888dc16d73c5339f8275f934cb9eca8e9

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