Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cbf6ef91e834ac…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 05:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 666bfbe18b7319dbfec4819f35fa4a88 SHA-1: a55a388aacad7eaa32c4ebc5ec0a67df43fd9c8a SHA-256: 44cbf6ef91e834acf65dbb3b01c23f4632d93c7558815db55b7d1ade22bd0885
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the phishing lure. ClamAV detection and ML classification confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=gps+map+camera+app+free+download PDF link annotation
    • https://itracmediav5.com/ckfinder/userfiles/files/8571937397.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8db8919d---48323816722.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61699529813.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/nozaxitexavamubobaboj.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tobezazekabinekelorise.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6fb650fe8850aa34dae5596291db1326/31420463680.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/3178628119.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275e06e024---72054514806.pdfIn PDF document text
    • https://parkettworld.com/upload/files/jopivamatevexefoneze.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/ruvexumefodipitagu.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/xikomavotirafutimuloromi.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/banemisabe.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/47521366962.pdfIn PDF document text
    • https://red-adlay.com/upload/files/13897750891.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/8810220631.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21903663340.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xosobuxejer.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210904074758_w1r9uc.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/nufuvif.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/93782427924.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kizanaxebazapanepaloj.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 17080 bytes
SHA-256: 5201d4aaacefaaf342c25ccecd665a7d43ff8e4d9a36af762d03c12a3bb3793b
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 10716 bytes
SHA-256: 99869367b5b57625d8ae0fd049688bf526ee2d545015a0f60c6872d8e28a51c2

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