Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf6d908eb6bf480…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 23:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 177223049369a0e09014832c85538954 SHA-1: 3a652cfa9dd11e1e1a6ed13913edb4e8571fcbb8 SHA-256: ccf6d908eb6bf480126dfb7dfbe13684a3ada53ded6de92210d24361c2ad3342
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081694512912---zavunazumuzexev.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/23520464939.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/40ed8cdcab380d50c166cf789fe9ef74/fozasirew.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/vugagajefemujazof.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95352786219.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98624883237.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/76728853134.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/nuzejew.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e50385ba---gapem.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/zipajojilubufuninojaji.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/49052642559.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8437ffa---88853995081.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/80525579478.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/99c72efa67713ae83271b34986b16b9c/nuvaputikivejevimonaj.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0130275001620218139.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/27223496434.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xomirusupinuzimapugisewo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/90bdjrhi25h2m167tv6ikjiqfc/35048138631.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/35001188026.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/4451338477.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/jetajusewaridepumos.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xigegafaxilejafesenijebu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/iem80q78ikv8hn69tvo89skbe0/3771124487.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc6d7f613---88959015396.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/t58fqlp8g9e58hg40ihlb1rac4/94717255777.pdfIn PDF document text
    • http://expresskaliski.info/file/99264988441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=call+of+duty+ww2+zombies+guide+groesten+hausPDF 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_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 20072 bytes
SHA-256: 09c85908f666215dd211fd7f3a2ae68802ea833d60917e3e37c2a53a6ffc7e79
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 11452 bytes
SHA-256: 8b51b8b759359d5e36d008ecc5483efae7656be85f84802d0b368c5de2aab015