Malicious PDF — malware analysis report

Static analysis result for SHA-256 16972a14ad4e8aa8…

MALICIOUS

PDF

111.0 KB Created: 2021-09-02 21:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 28ce558c4ab8ab7426b44a89a49651b9 SHA-1: 83055a5fc8545eca6c356a3feace02be6cfe8c3c SHA-256: 16972a14ad4e8aa802ab8d89ec20e9ec68ef8dbf2825f3c0c2af5419041d036d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious sites or for phishing purposes. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristic and the ClamAV detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3480

Heuristics 5

  • 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
  • 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://accesoriosalmayor.com/images/userfiles/file/vamifituxawegijewunevasab.pdf In PDF document text
    • https://ctsgroups.asia/images/file/41620980257.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/82841898686.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f576db37800e9ffcb925c050ce458e56/mozatevedavobetovebe.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/sijivavasenasijojili.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/nopif.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/sodipod.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/44848595316.pdfIn PDF document text
    • http://isgsrl.it/images/file/64690010521.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/79hn152afruake3hlqupbsl4bc/25224585843.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d6301b19b---19466296698.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jqne5v3ob0r73qtd8ia7e98duk/wulixekakiwizufefodut.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7c7830c5413bf494b8295cdbd32f327e/xarasunojosudi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/100077fa3070416cea80902fd0ce8bd5/92777402985.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/7294043203.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/86491882040.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/96730897563.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee0bbe4bb---9382316145.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bb91d5fe---83383539871.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/foserofemoperalejuxap.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/92062847113.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa55dbd1673---galevi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f2460d14---98707675978.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xaruwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kia+sorento+2004+manual+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0D 21480 bytes
SHA-256: df3d23caede1f7296a3666ecb0875a6574c0c8657d00c4710b852b0c57a98046
font_01_sfnt_off00019560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1