Malicious PDF — malware analysis report

Static analysis result for SHA-256 08af2127fffcfceb…

MALICIOUS

PDF

161.0 KB Created: 2021-08-09 20:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fbf199c6f7cace3c5bbcc6dd793e94f3 SHA-1: 320de580c13602bcdd0ab3d235d099b3069cc056 SHA-256: 08af2127fffcfcebb014e62d993d485a29e7e41b5a83fd2fbb8f90814ad5303e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=mathematics+questions+and+answers+pdf+download PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97a9c16a4034b0cc51e74e3334f4c5a4/98464966515.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/fasetanuxiluponuso.pdfIn PDF document text
    • http://stasta.com/userfiles/file/29391975199.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f716ec5078---matofaxovalivo.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/72021952858.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/69839667665.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7b0e1f459f3b502341e63d1e15ca0779/keraviriwujejamejaja.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/82756028229.pdfIn PDF document text
    • http://salt17.com/userfiles/files/kakagidevinexefepo.pdfIn PDF document text
    • https://dhesient.com/media/98977737009.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52566740316.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de3205f7c807f6ced14ec33e1c85c69b/46926546688.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pijikopitasobutexusova.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0a2e2172dcdc6e1c1700b31a4237f793/72217005822.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/66790651430.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zipiwabaf.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9657656f---mepirunimekonivobiwo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/raduwadisowebifuxinopikaw.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/dososipekojiropa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sja0gudmtiqbjd350ekn9bpe2g/7621714169.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/necmc4594qng8ngd4es5e0d65n/59122966729.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9770b0443---29505324788.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pseqga37r4c2t6f4qe46laie0l/46419902212.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mevedorajifonelasolare.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062601e1415---xetuluninewapepimep.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_off0001f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F71F 19636 bytes
SHA-256: 97b502d265a50eff522880b00a20bc46999e26515e2c29ba7e93f728fe3216da
font_01_sfnt_off00022be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BE4 11208 bytes
SHA-256: aac79fe5e8c28ceb9496ff3d008849c062afbc16de96dc918ddd964dae263ed3
font_02_sfnt_off000245c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00025dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DDA 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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