Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd5856026f27e91…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 12:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98b2f17857c90688205bd2d7eee31c9a SHA-1: b6f0a0e18d02799be01f354f622e839c9718d763 SHA-256: 3cd5856026f27e914b8e86667dc658f778711141cadfc39db51276409e653a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=the+singer+solution+to+world+poverty+thesis PDF link annotation
    • https://kamwalibais.com/userfiles/file/sokaleto.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/62246515217.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/572b1532faaebc58aa8f37a9f267410d/58521461295.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/59837944735.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/60977193831.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/47646664547.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/92465986686.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kikumomuvokibazirifafute.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/noruwuxol.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/85067850745.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/6636136188.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/89313020226.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/1749411538.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e3b3633c1365ef5012351f6c78027ff6/lilazuxoxo.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85242695622.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132978e63944---40106812490.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/simifixonifigijobaridi.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/63512199581.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/73592234387.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/gorononoge.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/8500454061.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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 10836 bytes
SHA-256: a16595241ed0537214f4d897bbf91315d3286d2496b1574221c0abdd7b59cef2
font_01_sfnt_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 15992 bytes
SHA-256: d9b8c44da8467ae4a5a089f2a6eac0738584817e0bf2b87ea49069f56e1f46a4
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1