Malicious PDF — malware analysis report

Static analysis result for SHA-256 8342179e350e6b88…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 11:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a9faf7c7c6e4fc1b475118511b232cc SHA-1: 71b54043aae09e38f5ad43240ef5178c74e75fad SHA-256: 8342179e350e6b8850aae126dd20cfacdf5cbdd522f8a02cac81bb6d80015492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=kinemaster+app+download+play+store PDF link annotation
    • http://xn--eyt274i.com/upload/files/86606595653.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/jasutilatolufi.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/gumudijutot.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/mekes.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/gixupokuwitozodebe.pdfIn PDF document text
    • https://hssanesteban.cl/files/vodewebitewufotapovajule.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/gosisozonujonobugova.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2c55f26e5bb633e04f7b4417fe95284f/61513669460.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8f31d5713e969d8433eb9e2f09f0/86795001344.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/68549498312.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/dapubemonewowulivopet.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nexiduruzuvos.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/79104076377.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48663a4df---70568730417.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/13929970127.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/bomilutuxafa.pdfIn PDF document text
    • https://sealskinz.ru/files/file/19431734761.pdfIn PDF document text
    • http://www.77ice.com/upload/files/xibakimuruziwutudobo.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/94330053237.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/76376250470.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/39491165299.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/dokotesovoxibonef.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210914_CE503644A653C8AF.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10744 bytes
SHA-256: 30e67f24ea77d6c76d0080f9bcf451dba5d886a103ecc3ee478c9a3c9780ca1c
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 17036 bytes
SHA-256: 97ea0f70c39c2fe70bceb3842c5bdc7205b0716a327c599a09af1838d79024c5