Malicious PDF — malware analysis report

Static analysis result for SHA-256 4682600804621dbf…

MALICIOUS

PDF

74.6 KB Created: 2021-08-18 06:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63e082fc713e3390a7037ac49c6cb273 SHA-1: 0a222b3e14d692535f58056fbbe36c3205a02797 SHA-256: 4682600804621dbf698f58e20c8c8c6ba1c677bee1c786a427c4cbd25a92fec9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://etadelloro.it/images/file/51192414344.pdf In PDF document text
    • http://esoftland.com/userfiles/file/nigapikovaketekomekaf.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3657dcfbfb---vogobo.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/4266738268.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/suvopuvigamupafepa.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/delasalojunujujivafuw.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/xizugufufulejiv.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/92866045865.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/2840224022.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/8970093518.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/62210444451.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/ginugupodalonatuvese.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__610617CDE445B.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/m2k33shdnjg3mlvnefdc3tqfse/88600160231.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/bokavebogewopes.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/notigufogajarul.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gucsu5jfo402fm2f01bm9b1sfa/95423121631.pdfIn PDF document text
    • http://mebco.ru/images/file/wukapogesoxazepim.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fc72fdeea28dbc6a2755978fb7224958/33359419475.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/87889817913.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21191444756.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/lixifaxemokunukumoz.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4i2ubuh06hd551a6js16lb9anq/50406285845.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/236e96fc6eb8c75ec0780bbf4e3e1719/47002361213.pdfIn PDF document text
    • https://toocapen.com/files/81181523105.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a981c06a6---lukevitine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=is+l%27oreal+colorista+goodPDF 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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 10424 bytes
SHA-256: 5bf2c67293df3f4ec772f4e7b5348e7f7e4a78c6c0320e4ef1ab624d6b76d45a
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16380 bytes
SHA-256: 0fc175b87528eed5a9743f478937ccacd63067e1a9272d7dce4ab87ab95169aa