Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dba4ee84a2e619…

MALICIOUS

PDF

93.6 KB Created: 2021-09-15 20:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 699b8c3a348772d5eb4be2a9aeb80424 SHA-1: d335688522778aebb60cb7937c3edee6c1ddc1ac SHA-256: f7dba4ee84a2e61984e5a2aa2df0635d137de0a721d9072e78bc40cc76f9d4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that redirect to potentially compromised WordPress upload storage and other disposable hosting sites. The primary goal appears to be directing users to external, untrusted content, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://irlanc.ru/uplcv?utm_term=how+to+hide+keyboard+after+typing+in+edittext+in+android
    • http://heichapuzi.com/uploadfile/file/fenuturenumidezuxigidijuw.pdf
    • http://tranhdaquydep.vn/upload/files/kewapewu.pdf
    • http://szguilong.com/userfiles/files/40860745160.pdf
    • https://mayphotocopydogia.com/upload/files/91199611435.pdf
    • http://gillsandgeckos.com/userfiles/file/10696021524.pdf
    • http://discus-rus.ru/upl/file/pamobeg.pdf
    • http://leebyenghun.com/new/upload/board/files/35606210843.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161409bb504bb0---pimaxexupigedofojedutaku.pdf
    • https://tdfstore.it/file/gajexuberonawixalofotek.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/51565907725.pdf
    • http://adasbruiloften.nl/userfiles/file/6405236585.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/14479378640.pdf
    • https://neurondevelopment.org/userfiles/file/xepidutadu.pdf
    • http://yuli-china.ru/d/files/62797273954.pdf
    • https://pfollowers.com/ci/userfiles/files/lizer.pdf
    • http://surausa.com/uploads/files/62299329577.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/polaruguxivowul.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/90058856140.pdf
    • https://bunyaminerdemir.com/resimler/files/95710626480.pdf
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/bumemidofo.pdf
    • http://kozszemle.hu/uploads/files/72566584745.pdf
    • https://drinkpoint.com/uploads/files/24276662536.pdf
    • https://dampinggame.com/calisma2/files/uploads/75164032032.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614060e9cdd2d---21058597378.pdf
    • http://webminmax.com/userfiles/file/zugufakenufexeretuveno.pdf
    • http://propertiesforrent.com/userfiles/file///14317292615.pdf
    • http://liveranigioielli.it/userfiles/files/59400528357.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ba.bin
0fa2f8586b974a1befd6e48a27252305fd052086dceb196891cb7630eff681a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 11088 bytes
font_01_sfnt_off00011e1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
font_02_sfnt_off00013631.bin
666c061f3010e2ef9c93f0820072ff7c747da2d705e1a4907849e2913a915be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 19072 bytes