Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fda3b6af039ef44…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 17:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73bc050cfb0df813ff136a15eb7b0f20 SHA-1: b2c4364c333553a2c42ddbda670d1bee1b86629d SHA-256: 2fda3b6af039ef44ffc75352a1f96a77d4fedfde733a7300677543727a5ec84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The PDF's structure and embedded URIs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=more+than+cool+reason+pdf PDF link annotation
    • http://aatmicscience.org/asuserfiles/file/35893988128.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lowimewumazedibopuj.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4a19bb48af5d1b2f7a17fd9b6c08102d/84309849158.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/22690972224.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d35135d9f---ginaf.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/mikagetusili.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/70877310513.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d76b8b7219411c624ffd4347fb46d947/jilonuru.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/donikitowigitaxipubogivef.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338e1b5f3a---45900066031.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/28760237997.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109081706185293.pdfIn PDF document text
    • http://iscelenie.info/files/file/kuwezixelolibajijesakenak.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/bubapemizunidosoxezorov.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613793179cffb---wanekad.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/movofosominerepo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efefdd860d---87832592747.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/86808213044.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/76755330551.pdfIn PDF document text
    • https://breedlife.com/upload/files/5146725387.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/xuvedenufa.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/83345624473.pdfIn PDF document text
    • https://aneri12.cz/res/file/borinojepojidonan.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/womafumubitepegivonore.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_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 10620 bytes
SHA-256: e5cd11a02e2708e7b548d189f87977e9a316377282975cf27a1627f0c0c4f1f8
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 18064 bytes
SHA-256: dd1e34c9f0ae6bbd311d7518a8b85334888944bd4ca1d963185aecd324c256bc

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