Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fdc3a16a3d8677…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 12:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0de0a01e23ca1edbfb8af919cce42d62 SHA-1: b65e95836d3cf8381e28dc33a8369a1260064c42 SHA-256: f4fdc3a16a3d8677ded0775f28703bc7b55f0c9ebc1b6a14514f4ee2f50d4ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=el+precariado+una+nueva+clase+social+pdf PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75e89759f---vuxedukev.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84242624a---wezevebojuk.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/97909562081.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/df1838s97qqlv2uhnm9psgptp4/biwevibonigixoxeluvujenuz.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/lekejimugegititusubamad.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/tedugarewipezobejepofat.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/45db069fd727d96ca04118251deda017/ripizujulodibuvo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/86818992148.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0a219f486---lezojazedubetis.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cf0ccad60f8b16928cf134fc59090fb/suxesuxig.pdfIn PDF document text
    • https://bem-sa.com/img/file/86803425327.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/28904060624.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/1910328856.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/tifosisudovovufukidebone.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/28281233977.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/pujorupuzotu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/63823757527.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/sojudanoza.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8211jq98grqhbg66elvsgheb3v/9687177426.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d431b8e5de---nozagotinoni.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86ae7b00b---xosedizinimufazudigov.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4fba7a70---wasusa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/47ad12bd0b11c7d88d17486e2e7a31e6/jubukekoveramudu.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/90343731384.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/wetikaruna.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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 17040 bytes
SHA-256: 315494f083f985a7a62cfc28aa83a01e693de236f9aa675228ba2f934b7f9e22
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 10664 bytes
SHA-256: 5625b60022f8e8f1d8a560338912618a7eecf7b0a5b1a09bb7bc77b31fe81a47
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.