Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53922fda5658cd8…

MALICIOUS

PDF

92.9 KB Created: 2021-10-10 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76fa52d2a3b69a9a0ae936edb06d6a41 SHA-1: 9b85f24aa7b14345b88f64e332e465fbe0be4800 SHA-256: d53922fda5658cd88b536d7aafd5ea706150b3a12738d2b5eea0af294b3b8d57
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bwlpsalisbury.com/uploads/files/50284877669.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ffc60ffb1---35091483278.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/28893716675.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/jagexosalutadu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/sibarexopew.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/denepapod.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/kapiwobemiv.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/misiso.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0dd48a7b3c9e44dc88722c16c5bc8cfb/worigelopazorowidapaziwum.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/46210088123.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jalawed.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/75544501247.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/rogigijarufevevira.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pupuropab.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gufexoguvupuwogezebub.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/sokikikisamawomujikowixa.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/51699250437.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4f9f7q8a11ok68crtgkamgnocj/biwapimetovusalupezejiti.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/72262008837.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/34130576803.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/95237798509.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/13468712299.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154380b21942---31450134695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+grammar+and+punctuation+checker+and+corrector+onlinePDF 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_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10960 bytes
SHA-256: f78c6b4313eb427757eec69daa8e78233f66fa71bc08e7ee61f4ab833dbf5f9b
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 19128 bytes
SHA-256: df275085c93f54532145c9f520a6f4dd0c1fccc53b9b48e2bb69fd53e0b3b0de