Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61372e7c8738815…

MALICIOUS

PDF

76.1 KB Created: 2021-08-21 12:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1adba08ca5a8a9b3afdbb38a95ee24c SHA-1: d47654b2b9c0a34382dfe7c30c4121f0b15c8ada SHA-256: d61372e7c8738815d77f285cb04ae44bdbfa8a0cb9ec47d198106dd768fb9635
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the overall pattern is consistent with a malicious document designed for initial access via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070c44b35085---xikupenato.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/ranefudixanubixukeradasu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a52a63839182fa0d39df475f1ea5d56b/27288476479.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/pupisuwikokupudaf.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/10257132508.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/zekakukudaxebamosimo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc00625d1---wegaroza.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff02e7a146b---mozavafu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/79923269069.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/81566406955.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/vamufugojuvuximipof.pdfIn PDF document text
    • https://lemanssrl.it/file/15032247861.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ot5s8tio2kunnu8i1jredrqlvc/72522878958.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zigarubum.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/15501037768.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lelumebunopiba.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/xovugegubupos.pdfIn PDF document text
    • https://inks.bg/userfiles/file/19534415843.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/pexaxekejulesapuduko.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bafcad89---39775564360.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/33363170247.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gezajexoranunetogemu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/temezowenove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bhagavad+gita+odia+pdfPDF 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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 10344 bytes
SHA-256: 2a5e4941562e3f8f32d79861a1547f411e6f5239474076cd875194053e76a954
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 16952 bytes
SHA-256: 5dd54782bdfb42bf050322f8b4f4f0cf47492fc73f6b6fb0301f7ab2d0457bd6