Malicious PDF — malware analysis report

Static analysis result for SHA-256 274f5aadebcfc704…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 08:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48d84bb73641910449d1cd13f2b79045 SHA-1: 9ea7e52fe7462cbd067883c9a3943524d6ea82b1 SHA-256: 274f5aadebcfc704991360bdf28a04cf4a467769652756fc3cd1f7487620c001
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF containing a link farm hosted on compromised CMS uploads and disposable domains, suggesting it's used to redirect users to malicious content. The presence of external URIs and links to raw IP addresses further supports this. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://newcastlehigh1967-50threunion.com/clients/43248/File/53553412473.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610da7e185ccc---zabamidinewifokibuwuni.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867815bc0f---sanekusozonozuguguvar.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/womoxulanaluwif.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1629d22f06b975abff0b37e40e2b7d12/likebitul.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/devamawulixamavu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fdcff124e15bf6454e95982c0593b5ac/19862799027.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce947c61c---23857411012.pdfPDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160821dcae4b1f---pokufazotuvusus.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210901165347092961z68ulgyrzd1i.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ab925b8eb---39368121665.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e501233e---85470726868.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d106a2c14a---24818191071.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gefirurutugotutovivaler.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c2e97550---84301126151.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe0491f08---52999916438.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/leduniwomafanixe.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/65514674537.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/zijenutowebozuget.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/rewewilarapapukan.pdfIn PDF document text
    • http://schokozentrale.de/idata/27340260937.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/54648150671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=anaximenes+philosophy+pdfPDF 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_off0000bf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 10760 bytes
SHA-256: c3421d74343fe0152b29968b0500432917d9c86cd7a9b86ab0d3a127d34b5490
font_01_sfnt_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16440 bytes
SHA-256: 88ec125d74899ae17ea48e3c5e9dedc39f872330b9a309e702c266fffb7d0058
font_02_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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