Malicious PDF — malware analysis report

Static analysis result for SHA-256 d517512a2f4c2fec…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 09:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63b865124be98da2dd3d5add917aab20 SHA-1: 39dbd9e3d84ddca760fae9918fde4804579e280b SHA-256: d517512a2f4c2fec6c72090bb1eb4995fd01087c78101c002e5f33f7032b5aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://irlanc.ru/uplcv?utm_term=is+save+the+world+fortnite+free PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145049b27970---43238097992.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/vemani.pdfIn PDF document text
    • https://angkagenap.com/contents/files/98497710379.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/gusimusogimesubu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/71117544713.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/19532362267.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/nebiwiwibovuvelirodekizug.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/tizonajina.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/wiroxuwodosewawogudajunab.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/86460363790.pdfIn PDF document text
    • http://aa-nusd.jp/3431883132.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/79210064085.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zexetamuvamuraxijovoki.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/74558171262.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72489320611.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9j32fnuhnnuph1uha8n44jc0e1/lijegebilenafexumotuluku.pdfIn PDF document text
    • http://poultech.net/d/files/12761536864.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/72467480108.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/795345806.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/67397679885.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/betikumanobisoponidaga.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6ck0q2t2mii1ek80b05u0e19c9/36634773836.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/dufalobifipisuz.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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17028 bytes
SHA-256: 2d5345c124cba3b45b7bab2a9f37d0152844528a93776857de5437920a785189
font_02_sfnt_off00011af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF6 10552 bytes
SHA-256: 8ed511175e2f01a9559f8612a46d86a165608dccf1976a1a270df81fb0b42786