Malicious PDF — malware analysis report

Static analysis result for SHA-256 525721e4cf21a48b…

MALICIOUS

PDF

124.0 KB Created: 2021-07-07 09:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fcfbd3613d219a7e28635d97c42afcf SHA-1: a7aaf5b6551e591faacae231f8a5507dc87acbe7 SHA-256: 525721e4cf21a48bc869e8f068c4fb0379b9f950630a1a9817b78116cdb70181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating it functions as a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://allytemp.ru/uplcv?utm_term=managerial+accounting+5th+edition+braun+ebook PDF link annotation
    • http://artecgroupservices.com/imagenes/file/fafupatitefa.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a61e8ce4---39032319389.pdfIn PDF document text
    • http://farashimirooz.com/files/38245959769.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d58e0c3b93ddf1c59cfda36bb57f1308/fazunosipaxu.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/61306798196.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/vesenonotuluvakone.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc7725f46c---danowokiwemebetuketi.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/raxezetijot.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kbbotq1ru54g80b07unft331jn/koxuferutamaguxerizin.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/90517135270.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/63338260678.pdfIn PDF document text
    • http://gabortech.comadmin/file/zunazepirinewakedip.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3896d5d10a---barizupuxarobusodimovora.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5da97bff25bf812de6ab944037201d2c/82890879376.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/livapoge.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jepuvarowojub.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/47995996852.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gugesemikimi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6aada37a---21212285367.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/nogevanibenujututesi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/59eber1q93s0ap4h3p9ugmiiaq7h79lg/26662088522.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080065568bf9---matuwomagep.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9ff1c068606a2b066d58316c87307db3/60625619946.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a293a519f6a---gudosoxixes.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/9991941309.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/acj6ut9atgpltq62agk3850hlv/sepobanozirowotazu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/487b2492a976c4696e0f3fc132a506a1/kilog.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_off00017fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000197c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C9 18552 bytes
SHA-256: e8a1fbf18c5bde4d6eb311c80baebb7d2d09c969482e517b1e24f4de875e93ea
font_02_sfnt_off0001c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8BD 10940 bytes
SHA-256: b6723c41a33fc869e6bc1830c0b942a1004065d86e00a49b9d1542754af4b9ac

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