Malicious PDF — malware analysis report

Static analysis result for SHA-256 719271f8de4d0198…

MALICIOUS

PDF

100.8 KB Created: 2021-08-12 20:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5776f92e9101facfe8bfc1f9e7783c1f SHA-1: 4539ac146bb3f61796ebd723c19edeb40f510625 SHA-256: 719271f8de4d01985b348fd5cf6b23e70423aa308535bc61c45210f7fdd77700
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many links pointing to compromised CMS uploads or disposable domains, suggesting it's used for phishing or distributing further malware. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=gu%C3%ADa+de+estudio+de+los+12+pasos+de+narc%C3%B3ticos+an%C3%B3nimos+pdf PDF link annotation
    • http://airconbank.com/upload/fckeditor/file/momokoto.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3hkjfoaple9g3qndqvqc5serj4/88232664738.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3ef1ba41---21316292395.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bijonivu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/61587503843.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/dawej.pdfIn PDF document text
    • http://kaies.cn/upfiles/210620210211866583b8dlp9.pdfIn PDF document text
    • https://kede.org/userfiles/file/nidubikogosuz.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/rusijuse.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6316b3169007641c1ea91ad152af40b8/14917339192.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a04506ba---sidugidirodomivumalezig.pdfIn PDF document text
    • http://geasit.it/userfiles/files/pazomene.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a539b9b59ba---wetajisimuvopawaxebotafiv.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/32204899290.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ggm2a13rqcfimi6reb3hsu7713/48253324755.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/30737058083.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/kobigu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a447b00707732dcc81ee04c88238ed09/logokisikijomofepubozaxup.pdfIn PDF document text
    • http://iviltra.lt/images/files/nefaxagevaxifat.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/84582310361.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/49660317270.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/5309835622.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739555704f5---41253140264.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a27079945---2842807449.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_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 18264 bytes
SHA-256: f51d5157da3d83b08cbde82748778970b628160095f28b843aedb262ba4e609f
font_01_sfnt_off00014f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0F 11292 bytes
SHA-256: 74888eccad43a2265e0b39e18b9192a1a24b5e58a6a69425860ef4ed3a16c3cc
font_02_sfnt_off00016963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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