Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b98615589f4b22…

MALICIOUS

PDF

79.4 KB Created: 2021-07-29 13:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1321a3f476e48db8e930ef5df7b6ed2c SHA-1: a9dbacff5051971071e6c9e35744e987fe5d17e2 SHA-256: 29b98615589f4b228ca6a9fd75f6378b49a1634343ae4bf64321080c14f2fe0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan PDF. Heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting a lure to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078095685e52---71016161813.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cf3c14b79---dorejokataxemurusiwot.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/620321434bcf5202d7144de4106c9995/3873153240.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zugim.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c1hoq89cp4jfjng2cmdmrkjrn1/52298660589.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607248c369eed---54329664347.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ce7ad267---91854111164.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/g5kmjbmvkol88a3vsrun242kcs/lukewazen.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40d75e00c---26715175539.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9496006d1510cbd39014108605db7122/43760617576.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/xexiniruxevodu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/20bb17f630620a0709520e655ebc6f4d/42452877040.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/875565bd2874abd4e8ece0db1ba0bcaa/35522542012.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e3c2b348595014bbfa90e6d6f78581f4/49136846896.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/1297827492.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f4fd0229---zemuvusotikevidujov.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609102c719d13---baxufamezuxawota.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/96ce0647a0f902240db9c9325ccc7211/vifokebat.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/53918421874.pdfIn PDF document text
    • http://emeat.ru/var/files/4968070093.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/61156412616.pdfIn PDF document text
    • http://recamonde.com.br/wp-contenIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=zapatitos+tejidos+a+crochet+para+bebe+de+3+a+6+mesesPDF link annotation
    • 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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 17096 bytes
SHA-256: 7399761117f16ccf89c42d3422f1e24225c8c821e305a5b292295b5c0453a458
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 11200 bytes
SHA-256: 7be983621662d0eaf69d3ad38f66d65800c1ee910479b256cfaf38f565fd2ec0
font_02_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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