Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae17085093ce65b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 05:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d1b0e6e9fa833dc9c1595468d2f71c0 SHA-1: 4d0660637b305ebbbe2470e9978cf5b9b4ccaa93 SHA-256: 5ae17085093ce65b449c93e96a6234fa7a114bf964a82dc5424b0525e516b884
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The presence of numerous external URIs, including one with a 'utm_term' parameter, suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution lure, likely involving embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=the+new+romantic+torrent PDF link annotation
    • http://dtmaso.com/public_html/Imagens/file/taxudupabewusepelunigunem.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9f657231---60956446229.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/mupibokopukulovarem.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/lomumixiwa.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4suqlbtkjsnpmgirhb1jq8cfru/besuxunaj.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0f8ec6aa---rurupelesixatadim.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hl6bmu62b13cp5c7etkhavjn8c/21333415812.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/99695419408.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3d91ba70---damalebowetofimetumuka.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c14aa5b9cd2afd924d414122537a66f/79599924218.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd498c6ba---21046643086.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404b4ca7be8---xetobuda.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/69256395926.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/nidexavixuxazedide.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/kunadiwuxum.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/017373a8f2ca561e7207e68e99b754f2/welorodenibuvereralulenav.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/ruxowomerekepuwifivo.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/46111185322.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/2109164153.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/latin.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tovofagatenilana.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951757467589.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/50511009734.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/48994620109.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/nowudilujorad.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_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 17108 bytes
SHA-256: 44a5cbd6be07cc290988071f52dd42018f4bb8c2c51d0d3440dc2e8f47e36804
font_02_sfnt_off00013d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 10332 bytes
SHA-256: e783c43d5b21050c55ec6ecbffabb43b60673364a58e07511a50c2d6dda88ebb

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