Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f1d268e26b4b43…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 03:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa41706263438e25f7caa0971f07416 SHA-1: 2b0af118d8d6f9ccf3236dcd0926e42686913c3a SHA-256: 54f1d268e26b4b433e81b70c41871b868b0ba5efd763b8c18391d043c660dfaf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=dynamic+programming+and+optimal+control+vol+1
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2d1625c3---wekafakubuzekisaboz.pdf
    • http://botosani.ro/img/uploads/file/59208117918.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ifkojq7a3dk0alilnbdmafu12/rodufinijakojuzez.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac24debe0---75023964518.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfa80898e1---pifazafo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/df592126dd227c1043d62e322b31112c/4523690985.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f57bae543---42981627240.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609430688ce9b---36262978544.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/3mnp238hv3mnm9bn3ag86k5360/bizukudujavogidunorusuma.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/emb8brfgild6dd6o1ncv476q56/73865952807.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0abcc32d---22622857575.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb3936468---20143186419.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49305112820.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/dsds4sodf3sqk39sqs29fs653b/siseli.pdf
    • https://abofahed.com/userfiles/file/30298992327.pdf
    • http://pulsarvn.com/media/ftp/file/40151893442.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57de99f4---jipixebizoputitiko.pdf
    • https://equator-maritime.com/userfiles/file/voluj.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2bfrf9ar0j28vggraheu5aebn7/wugowasako.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adf046eba47---85978699137.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec38c0fb6---10645318760.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc588ecfe2---55200604404.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89241a238---63864962837.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5183055c---48426841675.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d813.bin
6db538ec0f54b402bfb7fcb766d36c4a0ccaab4c4048497bb1c1c5018eb0b6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10792 bytes
font_01_sfnt_off0000f0c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16792 bytes
font_02_sfnt_off000108da.bin
3e3353a6fe5e8ad11814281124041eb0752e455ed7241ceb028e28667864a97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16912 bytes

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