Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e34121a917b498…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 00:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35d4597294767d8e718d66c5bfa99cd7 SHA-1: 568b5e0fb8ecddc0683973c6bb1952b0600caff8 SHA-256: 48e34121a917b4986453ced3f30a5d8baef8e2154a91d133eb4791be81ea05bd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=most+used+fortnite+skin', are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=most+used+fortnite+skin PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad739e849---danawejonuvudirasem.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918033827260240mc69n.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/lepasajebikokeb.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/webulewaxasumek.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/33084487671.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/bibepegifelumonosoj.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/wulesibakex.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zokubititi.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ronutumujipu.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/79163519381.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/gamomapovetiwoleb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144243e84f91---fawowabasulatinelele.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dujasumozulas.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/gukigalikitivawivi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328a53c02fd---55836006420.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/pifatunoz.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/10990130025.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/given.pdfIn PDF document text
    • https://clickbox.ro/images/file/43705080959.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/nq14d7pn7scd1babm4n9spu5o3/sonivafogekoxa.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/larivejipowakag.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xabivobitazib.pdfIn PDF document text
    • http://synfarm.com/upload/files/71020408161.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614507e532f5c---70880533532.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_off0000b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 10324 bytes
SHA-256: 0bac6b8285181615fba5834a96ae5dd99d092a75cb535b9837fea0756a314bfb
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 14988 bytes
SHA-256: 8c9d7465413fc349a5072475e091feb538c40800323a53f622b2056114fb1ef3

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