Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d06d66e4f9baa45…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 18:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0be46e8b9d38aa409975d97040b2130 SHA-1: fbeef5149cc1c593e62d5acafcfffa556380cac1 SHA-256: 6d06d66e4f9baa45cbe5bd4860759ea9d0aa1122d2d369b79d6d4ea332b491ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The primary function appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://chcial.ru/uplcv?utm_term=galaxy+on+fire+mod PDF link annotation
    • http://studioagronomoserragiotto.eu/userfiles/files/kanig.pdfIn PDF document text
    • http://www.polni.si/Images/files/63330037341.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/gogozoxuvel.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10538968498.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f74c3683a---24162859705.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/zovufa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/14063775495.pdfIn PDF document text
    • https://bak.vn/upload/files/73647317602.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/sudinugeza.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaac72a1f5---zodezidadafozenuromireri.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bokovamovox.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/mituridegiteli.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/31871583955.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/90762064765.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/logetitabogugik.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/18204678990.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/97397132856.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61dpmcv7qtm921gsbai1q61d67/zerif.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bagesamewe.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wegifegi.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/kajudikavewirugumam.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/93837033180.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001097a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1097A 19376 bytes
SHA-256: 2d5fc78c9117e3c6b9ad3136dcda5947f03b2f8754a354b855422ffcc082cd33
font_00_sfnt_off0000b339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 10504 bytes
SHA-256: 18ee474a7d0b5368cedf166c014b4e982d25a7d08249684bf3cbcbbbdecca182
font_02_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 15156 bytes
SHA-256: 9dd7aba90cf407869e5514de1a9f724412d0748139a2b6fd846b24883b034cd7

Open this report in the interactive analyzer, or submit your own file for analysis.