Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dec543789565d1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 14:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 699343d2a669c5b37cef9e6bc02f9c22 SHA-1: f6618edfd31e72792aa9074bd4264e97548b909f SHA-256: b3dec543789565d10d98b63ff5c89349734c68a30e402bddec800898e113b45d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lure victims to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=world%27s+greatest+speeches+book+pdf PDF link annotation
    • http://digitalqwerty.com/ckfinder/userfiles/files/zuwatewemijodebolugelufux.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/40952385727.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/gezinesopafebajupunipin.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/ravevezamikonuke.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/25742324853.pdfIn PDF document text
    • https://kaimano.it/file/69717793281.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd6d32a623---jegulewekokogew.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a125473b413---maridabone.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7de01db2---18758370326.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021826554533177.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/27267049616.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s73q05bh7eehur8o95ltenoc76/3617064929.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/17594977963.pdfIn PDF document text
    • http://2440027.ru/upload/file/80549348706.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/24112882358.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/xedif.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/46f634875d9c10f192768557a26e5ff6/75453598731.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/24224628460.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/bakitivenisaxo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ipl2i9tmgn8segib49vpts803n/jexozupulofot.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/kisorulazorurajuwirawoja.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/99677809977.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/xomozonewigibogine.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10960 bytes
SHA-256: 5d2ae470643b470755c4001e2e1baed2737a3f41a5f200e9f4c6a0e7d526fa63
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 17988 bytes
SHA-256: 1a42a976c95fde742e859fc6dd135fb4f8162beda9095d7bd950a3ad6c475b3a
font_02_sfnt_off0001245b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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