Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06cd2a06181b83e…

MALICIOUS

PDF

102.8 KB Created: 2021-06-29 18:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3a5d634dfa14b06766a5a3f48939904 SHA-1: 3dad3b36b1b57e0d51cedfff0bfeacf6d4a362aa SHA-256: c06cd2a06181b83e8ce301e6f01881620d6bc5fffd7d8d8b3b688cef81142003
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=word+problems+for+class+3+with+solution
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/wikijakuted.pdf
    • https://acryl-bg.com/userfiles/file/95122571134.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/obqtklace3i4vggkcseh3v3ou1/kerogifopubosadoduz.pdf
    • https://muzeumkonstancina.pl/attachments/file/litowoxurix.pdf
    • https://aduanaldelvalle.com/userfiles/file/14313820309.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e5b3a259---bozigi.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c582ba39a---zidirebinatabitanike.pdf
    • http://artechq8.com/beta/uploads/files/tavatumuwojufevuno.pdf
    • https://estoniapools.com/contents//files/mavadupakifitozute.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efdb1453e---lilap.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbcb9125fd---gojupokanegavusodiv.pdf
    • http://kgmda.com/upload/files/sefilozuwosegiroxoxuze.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b965caa921cf623d5ac6bb032b14e7a4/dowezug.pdf
    • http://anaminfo.com/attachfile/file/6921163939.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16085c138170c5---lobubikobaxofuguredujom.pdf
    • https://marosme.ro/hirek/file/71203107562.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ff5d4b47---19766990131.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/60eb1b3cf84cc85579ed99c90be69616/mupubopemosusepasesulemet.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e06049516---94910455786.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700cbf08f91---rujabusilisuna.pdf
    • https://betalinktech.com/blmedia/file/bifukanevojajiridozok.pdf
    • https://memoservicesrl.it/file/bomupedepekatupevoxe.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113e517fc3---35678998230.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ba8655e43efb3e77fff3f83534d27e27/piwusazibi.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5e0d3b2b3d9bf8948cc1da85347b1ce6/dunagosatafemo.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_off0001297e.bin
2926ef64353727e7aef330ea1fe4e14ebb45eaea95bc2fc86de0f785f59969cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 19628 bytes
font_01_sfnt_off00015b3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3E 16792 bytes
font_02_sfnt_off00017355.bin
c1297daee759b43baba73b7dcff293d2cac239892f1efd4aae0c9ff1b409646b
pdf-font-stream PDF embedded font (sfnt) at offset 0x17355 11376 bytes