Malicious PDF — malware analysis report

Static analysis result for SHA-256 71143a0fc94de84c…

MALICIOUS

PDF

91.9 KB Created: 2021-09-07 17:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0521517420ea50ed1ba9f51467d4c7d SHA-1: db78185d0479434241f0888d00715f906ecaa037 SHA-256: 71143a0fc94de84c1a0b1a0f309c56115b3caaf22dc858c6f36a7e2d4f75c107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://haisushitogo.com/uploads/files/kedalegefatugimed.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/16bbf216d971b6ed22cf9ba92677d7f7/99814814387.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/485b4b7eccc69e306c96b3c20b465dfc/xopagirafaviwisomaj.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/27foamp2gm1lgp8f98cu752ph1/wubasapazimadorokab.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/48263148811.pdfIn PDF document text
    • http://firegallery.ru/img/upload/87720708136.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/87896099492.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ea77ace4---dazipagepimojexejuxuf.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215faeeaeb---59806008226.pdfIn PDF document text
    • https://totounited.com/contents//files/38664909451.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/29778773847.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5aba85f3---dulaluziw.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/ripenagonudenudezilakol.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9d26069d3c5854af776ad3d8d303443f/60021371669.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/38386109360e43193b23ac.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lopezazejaf.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/93565402417.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zujubiwubu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/mimevinorizigogugo.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/21302804032.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216291715194909.pdfIn PDF document text
    • http://usagimatur.com/files/others/72073902214.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8e586a849c4f3dda2d58e78ff16abb8b/77677495306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=difference+between+hot+chamber+and+cold+chamber+die+casting+pdfPDF 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_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 18564 bytes
SHA-256: d7b1cdf71248aeaad94f0c0d263ae8fdc3db13580d8bed1898fbc3e7ab579319
font_01_sfnt_off00012f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 11292 bytes
SHA-256: 3c3920a2b38fbaa6c84e06e3751d006589421b77ace82b5aa336c65da632bd13
font_02_sfnt_off0001492d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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