Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da9d8beec5ecb1f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 06:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d76be55ca90b8c7e6e3b1ab9e36f6142 SHA-1: d6d216d55be93fcb4bbeea2e9a12e827bde21a41 SHA-256: 6da9d8beec5ecb1f16efeba1f3a419c12083ff8a13c46df1cbf32a005a048378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=coachmen+freelander+32bh+owners+manual PDF link annotation
    • https://diedacorporation.net/freesiafiles/file/33817357114.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/6d4506d03d19b9a249faf488b5cbd539/rubasojipebidojosuruku.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/3508519045.pdfIn PDF document text
    • http://firegallery.ru/img/upload/deribipi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m304bm7su80i5ob6gvacrdjjuc/45972838285.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/99367129897.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/51699466408.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a613602f---vopitakexovudur.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jodupimu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ulot5rvtvq1gmvcllm7mbrp5gf/poridakuruwugomarudexul.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/97650624068.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/38996750272.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/rebatufozat.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/15fe55609cc321c986ed05ced15b7211/dexinunimudoli.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lqr9dlk3c20f0vosfjd61gotkm/vubizizizesut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4c82463efc57e8c4eafcf1eddb4a74e/93605440730.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/selirazarel.pdfIn PDF document text
    • https://asiabiru.com/contents//files/80585307926.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747dfb84a68---14614719682.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6d8cd988---jepowulolo.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/zusetosisale.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/28299890666.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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 18156 bytes
SHA-256: 7ea689f83115305e760870723d78d14132d313fb1101e64ef647c60d2203f4f8
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 11200 bytes
SHA-256: f25a9f057d6b60a3703a60dafd67ba8e8f51433d8f358ce9d552bfa14e737847

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