Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e0d95c9ebb54e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 19:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df9fc4aa0114f25f4086acb9cf3d430c SHA-1: 3c56470eaf9597bced5a88f107832c2e64701c7b SHA-256: c50e0d95c9ebb54e3b307316e35ce4b2c159d61be2ef965aefbfe27992932715
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://koddous.com/userfiles/file/74916653802.pdf In PDF document text
    • http://syntra.pl/userfiles/file/jixopojamup.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/16917382890.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf9a06d2e---zuzopuraf.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e554007ce3---mofovawepomeluduxamuvek.pdfIn PDF document text
    • http://ccshecea.org/upload/files/1530736448.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/25337257077.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/32901128993.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/5240013764.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/kozudipusinulakebajudixi.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/60141765636.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kunixaruketud.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/34015182130.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/366e78990398418b533df013cb379679/51046592642.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/90190012207.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/savalogojikozapikav.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/3052188783.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/96419729281.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/95908576702.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/bazusanamejipenet.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/1532828400.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cc50d64---51223488983.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/54594530197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+save+only+certain+pages+of+a+pdfPDF 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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 17836 bytes
SHA-256: 218562a19b8bb56223d5a47f8af23a1ea84b4fd06384e5e5199586fdcd73f957
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 11052 bytes
SHA-256: de6e6f1a9375b5b409ba0e56b69969b4a4c821321eb7d91394b86a3721d1c0ee
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1