Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7b3bad7ba9b1c8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cd47817262adad5f4c02d618ed848e6 SHA-1: 077fb6a1e491eac261814790a8ad6b659eeacdb9 SHA-256: 2b7b3bad7ba9b1c873912ab18ac4a1a85e6968ad7c37e8924426b1361d95c1ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=professional+english+pdf PDF link annotation
    • https://mobilieroccasion.fr/uploads/file/zagumanesewuwizexajomob.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/54360234272.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/losiwugulem.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/1237221680.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/fekesemegezolasafukuxal.pdfIn PDF document text
    • http://pololanna.com/user_img/files/dumulijunuri.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/67600633875.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/33168746191.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/ravoxagozanedigukopozodub.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/33214284205.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/wafinumeberojiganasipa.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zagagefemimoxegule.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af5c83040e---nenaxawalinufenebi.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/81760975308.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142332317b48---somazuwobenujano.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/vefupefolidujowosipaw.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/kaserubedulofugimowesu.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/bakeliponogobafetilanub.pdfIn PDF document text
    • http://hejia-ele.net/upload/85166135746.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eac665610---79788677446.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/18087964437.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/wefibuzerazuxufepikidonu.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109140224127841.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/72977260154.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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10680 bytes
SHA-256: f08d60f84418e63e9f77ccac3e9e0d09cef12279f76f5e8d12103675a4a318ab
font_02_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 14488 bytes
SHA-256: d07445cd4a610e3bf7841050da6b0b81086a0db73091cb27a182941c36831526

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