Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f3430eb2148a5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 15:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 630552b214c7dc4d3d7d8a0189366452 SHA-1: bd8a0d9d78b53ceacf5f1c4e63b67cb0310c97e0 SHA-256: df1f3430eb2148a57f4ab9858e7299fbd282457fa9a0f068dc376af20c02d097
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of many external URIs and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=punjabi+quotes+on+brother+and+sister PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2bcc373f---62762500750.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f028d685693f146c3c239b0b9c331422/12041660125.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e07454a45---96837281769.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d48217d841---53960978538.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d394ab1---bitozaxijotoseputijid.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa276bb559b---talurudik.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062709554970554.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5c3febb8c718c57a8d2b0688d171759e/54943609775.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/niwuzekomifobarixowos.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f851caa8b8d---wejarowevelowakafiz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/suv9j3j7920tobk3ui3ct5r3n6/jujanoduwowufezako.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/10589257548.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8451f9a2---zifetesemubakorevuw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4bba7155a---67047820037.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/tajasutevivedovilujinuk.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210717_010221.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tawafiwufowedo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/simidesafo.pdfIn PDF document text
    • http://packamate.com/userfiles/mopivologesuz.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/sezubuz.pdfIn PDF document text
    • http://learningkey.org/userfiles/826699027.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620911720.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xofotowojogaxalonetame.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/33408685745.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/fujesugimotebod.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10816 bytes
SHA-256: dd9aff37bb6ac270736264ca2e00b831790dc5ddf8884165f45cb6347f70697b
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 18036 bytes
SHA-256: f3e0e4677948b1ebf7940142757d8e3d6e5e5394e8a6246842cd88b8afd9c7ec