Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92dd7cd3012d316…

MALICIOUS

PDF

110.9 KB Created: 2021-07-13 22:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0409074c4a7a2a62e3dabc515cfaf5b1 SHA-1: c1b101eb771b15830e0ea9c1f2177c1d351c5966 SHA-256: c92dd7cd3012d316ac2a593799f49f3de722ebc33be2c96b332f38372fde5fd7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=the+outsiders+2 PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb46350c6---nilisudakijukinuridoja.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/numeroni.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d529889c25c---92812079241.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bl4qkmmefugqiq5493fnegl87o/vojusot.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73addf1e---31720383970.pdfIn PDF document text
    • http://turnyras.lt/Files/file/53191628614.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/xisikigigobiruxarokebu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xavofatip.pdfIn PDF document text
    • http://benthanhfarm.com/images/uploads/files/98761630473.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad264b4bed---35498702421.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6694145446---gazunefazofaf.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7067966c9---ruzebizomo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66164410aa---29825215421.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160862f3b040a2---fuvuvonekajetavoduwi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef9d37046---bodunuvodumalakodojadipon.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed28479356---vozokofapuvisag.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/navazokejelitax.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ouq8j2t539jrmc3spef1j7u9k7/manededilupifisokawujiziv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10216 bytes
SHA-256: e32b3b455af7b919ec760642ce21c9b3939f21eb11d46980d082eaac7932679e
font_01_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 30520 bytes
SHA-256: b0040e968623db8838a45d98b32300dd4bcec5d51208f0d53fa91bfd74c5545e
font_02_sfnt_off000165e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF3 18420 bytes
SHA-256: 383fb990658bddabb3f7dfe05322a4910f9baf5785f61ee12d7de317a1d736bb

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