Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8df99032f49724…

MALICIOUS

PDF

90.5 KB Created: 2021-07-18 18:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8499947b157243c74e6cb746ddedfca2 SHA-1: 322d2bc29101358dd508e906714c4e865d69e147 SHA-256: ce8df99032f497242e7263007ef53a824c91cfbf7c9e5857b3ceb01986a53eb7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://derechosenred.org/aym_image/files/tozude.pdf In PDF document text
    • https://saunadlaciebie.pl/userfiles/file/79624495377.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9619827d6---30420373398.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/wawadevedokowugiduxekiwiv.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/3171767264.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8be94f0c---nekevo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160983c6a91015---titokezak.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/29081600774.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e4bbsmsgjkven9lpdjncgtvvhc/28816204734.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rulopenapubikabel.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c088683dd5---gubajoxase.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/wunowe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v4nbp28l80r4h01fe392d71c6s/1874978912.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/27621839315.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/1265151053.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/727546e3f011d2fa2e24c29118b24c7c/figolikegezisavixami.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/84577842264.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6a6d220a45dd806dacbc8e9f04cdd09b/kelokuxila.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/duwazijosiwizepe.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/ronusemeg.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b67c45c13d---85579847546.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e991e333b5---88528813207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=alberts+molecular+biology+of+the+cell+pdfPDF 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_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17648 bytes
SHA-256: 8a4dd1416c521ecdad84a8c2e468d799a09d85b810ed9cf7217cf1164067dea4
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 11296 bytes
SHA-256: dfc1fd21d6b2c18194c1443991bf725e6e126a7c8ede0a885bd08d9b2539b9b1
font_02_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1