Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c96675a201da60…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 12:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: de97a97d4728c4148a161c79e9cf2f43 SHA-1: cef917e7caed77554ffbf64a7af39cd77aeb9eee SHA-256: 01c96675a201da60f2edea7602742b03fcbe1d397d4a18554fcec8bc5a7e2b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm designed for SEO manipulation or hosting malicious files. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://smcertificationservices.com/userfiles/files/65553476448.pdf In PDF document text
    • http://lienming-rubber.com/uploads/files/202109022303045069.pdfIn PDF document text
    • http://mega.kz/media/upload/files/59790620512.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161462e20b2f8f---vasigawebilefakozafaviti.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce9134a0aa1295a09acb03a5df642dc9/lusifopafoxetuduxa.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/favexakarazebugof.pdfIn PDF document text
    • https://pecintajp.com/contents/files/26120470403.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/31376133054.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/mugof.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/fiwavawonotoze.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/bapemejejorapulojaw.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/24144710010.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/nivinoxilifojeril.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/96207727712.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/bawodomevugijomexe.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/piloganijoxodi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726c9d16da---28261968897.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/mebivawet.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/90256919064.pdfIn PDF document text
    • https://sambelteri.com/contents/files/99237009111.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210914092744.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/bodaneda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=messenger+old+version+app+downloadPDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 18128 bytes
SHA-256: 8e6d9cf2b04d963c90e89fbcd7b9b381ff9305632fa955aff425d13cd717da82
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 10616 bytes
SHA-256: 2759ded7705084b049099a6728a4625664765043bea99db6af266ae05206b33c

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