Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d26aa0e8074c550…

MALICIOUS

PDF

79.5 KB Created: 2021-06-30 03:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd426d0fbc61e3b23009f5560b4f0ddd SHA-1: f5b0204c898f1e3f4715e38ecc3250a3442b6529 SHA-256: 9d26aa0e8074c550ec1e99d4ad1ec8b9d58e06b17ba6b7f6f2559909b5b1db44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://volkshilfe-vlbg.at/images/content/files/49262212650.pdf
    • http://sotel-perm.ru/site/file/75875047893.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a9434427---14134077708.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a103e3930b---3943645418.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/82cmo3k09jh9703oe5auk1k0u2/52988689712.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc31ac4e3---27633773126.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090085e6bf17---dotelobowobidozepolu.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2abbe101e7---92614988115.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae05864f0---nebizemaxuneweneroma.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c2431920f4e---sedoziv.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a0e6eb3---15726103452.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e3aef641a8fcb63d6e1ad001f9b40e63/kemuwefedalekoposikafoba.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6059rn7970ki5q2nifu63pe26o/19690634389.pdf
    • http://teifsepahan.com/files/file/41218199235.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/79660a0892888863fa7fc8b1ed7496aa/45509626888.pdf
    • https://scavilecis.it/userfiles/file/wuketetamidukuw.pdf
    • https://artasedanasingaraja.com/uploadfck/file/38934547773.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eeba07f9f---vijarozesad.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7ab6640afdf31a2254fb34810838fda7/5750841438.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e13f3b2c---75659448777.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce85fed143---42668186467.pdf
    • http://arohitourandtravels.com/userfiles/file/jejazebotelepejuxuxul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=560+divided+by+7
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c20f.bin
9e130dafc5a759a7135ef14f2654316aa2f0e7fcd2a08faf81a49bcbf450ad51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC20F 16044 bytes
font_01_sfnt_off0000eb94.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16252 bytes
font_02_sfnt_off00010174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
font_03_sfnt_off0001198b.bin
9f9d51e91e714d833c3268f333f7c6e21392904345ef044e6e8f8913f7d41b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 10140 bytes

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