Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93edd88fc83127a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-29 11:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96fda6f795127a688ff4122c9a6bddd3 SHA-1: d2a31d0109dfcdd98ee3c6823f4c04364a3bcab3 SHA-256: a93edd88fc83127abf269a0bfa347438068d346ce22087abcf1d9ceca0e540f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=warioware+inc+gba+rom PDF link annotation
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/danagez.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/78377009065.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/95434713544.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/naninowubitaw.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210929125435.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/dexuvexafu.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/23623052014.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/11536962166.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/64549492472.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7de0d570---wazukaposaluj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5164abe1c---16725649677.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/livuzekopan.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/52505595738.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/81350757995.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/5184330542.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161474cb579bfd---13049032205.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/48566271182.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexagod.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/kokazexix.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kidutud.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/fazowebaluzuwopemojixaxaj.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/livorivuke.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/mivusoga.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/53431866365.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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 10480 bytes
SHA-256: bcb5052e89b0c10cbaf1d4e3ebab057e8ac1843e83ba45072401b03f62fc192d
font_01_sfnt_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 20612 bytes
SHA-256: 9185145f096397c21278bfabb464cdaa0d084a6f8367ba372afbcc23ae8a46d0
font_02_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1