Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff296472e930fbb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 03:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa1aba55e9519d7b753fbfce93987221 SHA-1: 415ad107a9d94b2a59f264730be4757638ae2f41 SHA-256: dff296472e930fbbe59c6009029aa255e88b23a9af2566016e98c31f210b400b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload storage and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malware, aligning with a phishing and malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://procogs.com/FCKeditor/file/30777733179.pdf In PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/88889896288.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d703f4db777d63ac7ef041a6f6982cf2/xesuzulukuxekulu.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/pebifolotatuvazuni.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/nikuvarepejenikuvuvi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cd22e3788---22231218463.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/26f23ef163f447cff15ebcf6590c0016/11147253271.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/mamuzugadapewixovid.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/kufokobaxatap.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e127b85c58---wixejad.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cd94642bb5e86e38809794206ca95812/muromeni.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7348622739.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3919c10e45---55102972260.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/98225972804.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc08aabf4f33a23a49da8a501bc8f11/buxufikusipalulowomoju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/76eddb1fd09745427f1ac36181b065e1/40399724043.pdfIn PDF document text
    • http://falerisztika.hu/tmp/36227809861.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94e3e73d26---95793315949.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/66478004330.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/79568232542.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/60661225053.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210820073727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tooth+decay+on+side+of+molarPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16336 bytes
SHA-256: a2c01050825e7b8fa78ebd81492e9c4cf726bc2efa97d09d636acaf56933fde3
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 10820 bytes
SHA-256: 7054b090f079ec80cc5de34be87e3a8b03b83ce7bc777d1f9544846f8d2efdf9

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