Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c74091ee1fce6da…

MALICIOUS

PDF

89.1 KB Created: 2021-07-02 07:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f42eb10b93265947ee56d74bdc81b11 SHA-1: 544c38b26c44ebae98bc922cfb4fc7639aa7d395 SHA-256: 5c74091ee1fce6da3be7b520b4cd3d402e9ddada21d7bc3fc34b1fd0f20a44e4
156 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. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=extensor+tone+lower+extremity
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12be33860---wewatedetibexafoke.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e3df826629b77530afc42c7d750af754/dirorifubaruzapevipafepe.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae482ed---rajogilarevogikogaruz.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a14831edc26---biborexive.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/32d58019f60afbb1fe44367461efe77f/54705861022.pdf
    • https://aterhesseg.com/up_image/file/48482585926.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed021e7d02---28000817032.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc3a239c00---babobejovapusufufod.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/88803118807.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f8cb47dabdc43eae6b85dab885b5798e/79076301637.pdf
    • http://ural-resyrs.ru/data/file/64826265250.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd98cf478---tikegafa.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4bd836eb---nexusutibomadolapuzover.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870864901ba---96865671338.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4589dd6eda---9763448858.pdf
    • http://grimastone.ru/files/foser.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cce76e02bee---72095392715.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca812651f3---gopefusaginusikedakabu.pdf
    • http://tetraeng.it/userfiles/files/ziledobazejowen.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7fa3e1cfc31e66e9d565be618609fd49/lonujibivabezaluwuli.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1642b18c22f0f9664db88d708fedae99/35656287975.pdf
    • http://thietbiotoviet.com/Images_upload/files/tikarulaben.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b005cc1d34d---83268278157.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/nakutosenemifomematela.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788c1eb35dd---totuzapadagajoxomo.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_off0000fbce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16792 bytes
font_01_sfnt_off000113e0.bin
e38cba07c6e8eaf4c7c05a0bbd755ac1bbff253a7ddf0214bcf035b11d1f5d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 16812 bytes
font_02_sfnt_off00013f9d.bin
539961fc5e19bcbc458b3f08614aa456f5bab9c43498aa7e56d6a040c4d8287a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 10392 bytes

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