Malicious PDF — malware analysis report

Static analysis result for SHA-256 de78604483815450…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 17:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac7ab2f61952b924b53d340674315b68 SHA-1: 46fafd0f013e93c692b7a7f2ae64ed491d03af4d SHA-256: de786044838154508810c5096e51cb7970694b75f451a317cd41f0d2662e433a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing its role as a lure.

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://vswet.ru/f/wodibofezibavemoxaf.pdf In PDF document text
    • http://ramayafaith.net/clients/64268/File/35954636040.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/98838573846.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/feleloko.pdfIn PDF document text
    • https://dcimx.com/files/divazinimedumaju.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ddb2842b1---61120884642.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dbnrr2do6t4g2rh0u4ch819u4/63386525717.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/5438588587.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b0hc4vh2ivj67rj3mcq195p1p7/31029144445.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zarofunimakesopekaraka.pdfIn PDF document text
    • http://standardamulet.com/files/files/nukegagasak.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161141464cd073---gusefugorade.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210826064418127218626.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/41299700826.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2ogs0f1kkvvr5fbel7to9r0gt/samufenoxuvu.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fawamijod.pdfIn PDF document text
    • http://kunbot.com/upload/files/romogevikuwavuweki.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/taxasagimosuriwuve.pdfIn PDF document text
    • https://viettrungson.com/media//Files/gerazakatazagiramosaka.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c36b265---11456692022.pdfIn PDF document text
    • https://premium-house.uz/images/file/kanibokexozadupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=oxoid+culture+media+manualPDF 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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 17560 bytes
SHA-256: 6358ad1386077b23eb59f3a9133f417a03a56834af5e9003269da0e34b8afdb6
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10592 bytes
SHA-256: 3115bbb81a59c35245941bf38f759f056abbeb5b6a5aeef82901d0dcc9e52650
font_02_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1