Malicious PDF — malware analysis report

Static analysis result for SHA-256 36800f627d985d6b…

MALICIOUS

PDF

90.5 KB Created: 2021-07-13 22:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07f763436185fb4fc0906a22a8494230 SHA-1: 2362b4226f6ac667df26d430561b74a2f5a39044 SHA-256: 36800f627d985d6bd59a52297bf3bc7557d2d9e67351184d044d44abbb7ede51
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af6296f20---41464612344.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766b69ab98f---75851620318.pdf
    • http://apsara.ru/userfiles/file/vusawad.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/girijofowaxove.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r8k5nc6s3buip7v4r68npp72rf/jugiruxegewad.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd2a3d9a1---suwenuvoxod.pdf
    • http://dobrejaja.com/Upload/file/rozug.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f10e90860---fejeriwodebanug.pdf
    • http://annabarons.lv/files/files/kakinavopadorade.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/upemiobbbv00lvg6u4ingfg0qp/rixelujozosezamo.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/fatiwafizimilafife.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/022e1371860a59ddee966b4ce9ebf62e/dafut.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097797030034---fupifasokebuma.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d71b097ed0f607ccaf6fd89c8a05a72d/zowovituvojisofawivoxi.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb206a488e---mezikukitak.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2869066b8d---nodosedoz.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/dutotogazewefikapoligu.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16235492495245.pdf
    • http://bulgankhangai.mn/userfiles/files/xibifubuladeko.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d205fcb169---xurizufomafejowaxidazo.pdf
    • http://clubselectionvoyages.com/images/file/danux.pdf
    • http://moda-minulosti.cz/docs/momin/file/52140994384.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/226fc6d9dce797a276f993032fd6c440/91611543983.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9658ca1dc---80418870952.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=codeword+for+letter+r
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff18.bin
f4cb6625343307b1ad20603bcbf32f9849ef297aea657918988b30ad0f8e0dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 17984 bytes
font_01_sfnt_off00012ebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
font_02_sfnt_off000146d2.bin
618a8a05a4583baf425ae085fe4667e486e4dd78f4760b9cf6f3e58574698b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x146D2 9936 bytes