Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7532bfccac710ff…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 01:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf97809912402660ff7c39ef28975502 SHA-1: 0f07e42d89c5fc536a187ec472b3a1c97efabf62 SHA-256: f7532bfccac710ff7dcf3dd6f6b155f63f86f2ebdd64f01387522ab38c9e6015
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'cmd.com' in the document text, alongside numerous URLs, further supports the attack pattern of luring users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=export+excel+to+pdf+vba PDF link annotation
    • http://pietrek.com/MARCUS/files/file/4333270048.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sibedofexerib.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/mujuxixivonizebiza.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/jovoxopovikapebanipired.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/14330004395.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/12748769301.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/15829107727.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/datl6pincuf5q649c5vtbrkg7v/latuwinifanevepuletanil.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ucnfdoptq3lp9g5t01hj6ec8kb/96741384208.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15228743220.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/xususef.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/feruranegirizarus.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9167ea18f22634a34fa511ae0134bef/53901540866.pdfIn PDF document text
    • https://mangallagn.com/images/file/tezaw.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210911044538.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8f3q3prdhsfqf1epskgeennafu/85952140089.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ca4fa67eb02dfd81907a6477da384153/81457142403.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/91687757261.pdfIn PDF document text
    • http://qdcmd.com/data/files/lalavuvurugepalelunoxeva.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/54141538700.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/pozajebamin.pdfIn macro / runtime command snippet
    • http://kaushalacademy.org/ckfinder/userfiles/files/58398624710.pdfIn macro / runtime command snippet
    • http://coyada.com/up_images/up_images/kekutivoke.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210917162319_1572818608.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4d5d27c8---17784351016.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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 10540 bytes
SHA-256: 353f9f1e62adfdd1724a43f48e2d82748a2bf19bb19e3128ad47a665454048fa
font_02_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 17248 bytes
SHA-256: 940c90cffc1a54a023f9bc5f31765f1b2f6b0e2bee1a8586954c5dd4ba4faddb

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