Malicious PDF — malware analysis report

Static analysis result for SHA-256 8566e117e6c9f2da…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6de69953083c83f076d8c1a3b9a8d35e SHA-1: d6eb6015dd26239526c93df59a22583f9e790501 SHA-256: 8566e117e6c9f2da337f381a3487eb7d14db434bd45508c0dbcbf6e92d5b9c11
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The primary function seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=formal+methods+book+pdf PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d1f8e2150---99344285091.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/zoxubixoxoresinigatiwo.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/xapugavozewuzugiwuzesijaf.pdfIn PDF document text
    • http://hongdacable.com/d/files/terevasijojojewojanigeb.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qkekrv9tpl3scmeb21p3c08o57/95375401130.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c78cedda5---vududemanakebanedulilas.pdfIn PDF document text
    • https://langumeistras.lt/i/File/56260643082.pdfIn PDF document text
    • https://badoza.net/userfiles/file/lobanigaxuzotobolo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9282b84ebd095a54676aac57b98c06d/58114930599.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zakirogenoninolib.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/30/falipadi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd5a85af9---dajagivijimu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/wejifeseraliliviriga.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/dixiw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a8a2ddd606c3d84c8cb064819c192629/gesuzifexefoxemizupejawik.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/melizelokilu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/88635788845.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/xajonadewo.pdfIn PDF document text
    • http://synfarm.com/upload/files/tekedi.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fofufemapibekerabokeraf.pdfIn PDF document text
    • http://allasclub.com/campannas/file/68549289881.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d18c26cf9---lewutuwipilometik.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/83541434273.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ab18b1dc6f727d0d1e7333d6fff18fde/15417306037.pdfIn PDF document text
    • 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_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 10776 bytes
SHA-256: a0cf597e79b1a94f9f2e43414b66c631e61af1f167c0c2887d873b63c3993224
font_01_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 17124 bytes
SHA-256: d2b3eea9672a10efbeb98a0d4538975b8d462b91cfabc568a14f45549dd68560
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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