Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7e1cf163b6246f…

MALICIOUS

PDF

97.7 KB Created: 2021-07-13 18:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37efea198f076ec16031829440a3dc96 SHA-1: 5fe4c14c29ea0a043832fdca862b700f2cd2c2c9 SHA-256: fc7e1cf163b6246fe510c0fa40da5f7aa71d61f9a0f7cd6fce61c87d6677ea6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely as part of a phishing campaign or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://taxiluzern.ch/khurasan/userfiles/files/budaguvukurizetakatox.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee7bf376a---femupojosutusu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///18186234996.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/812f97fa5eb864b8441664087bb3c18b/zevevasebijarim.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cfb26351add9a2130ffc5589003110d3/jonufikob.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aaa43152c13b56efab6104b26fd16b48/nuxusivowutozaz.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a01d91d72f3b9963fb872ef800601ce8/fitupawa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dad185b14---sitatatamesabekatux.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/63678595127.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fa0bf4c3---76247993637.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4qc4sn00tiajmnrlmb4rlchvde/salom.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/baf19923975c8116ec62cf7d9fb53eb4/latugesetegaviwuviwelo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/maxewed.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210707084609.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/427ne6g61dh8q3qq1lq36d73f7/65359179281.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/14617748921.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/revelufafijal.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/wibikovazajotujonunu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e109e9b78---42212895074.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/be7a345b1fa8d66be9757573bf3c7925/46153252425.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3d3db86f---rakuzeritavubun.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/61fa96713cdc9991a1f92905741d9447/84900577247.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4999e1d8d---87642507695.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/ropefofo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5b339c5373184885e8aa87677e067bae/11580082977.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5b00369134cf9a569cd1d6f39ac26a5b/68583648194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=8chan+q+research+boardPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 17516 bytes
SHA-256: 7ec675d8e3dcb65d8ddccaf87f2af66c89aab9b6786fa6aa6439701759b15cb6
font_01_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A6 10628 bytes
SHA-256: 3cae2c0f5388fa43ec1c5f5f381620d80e56a08955b131af3ce1064a9058f381

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