Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f836bc0fcaf3de…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 01:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9514c4da56c1d71001b3a08af2de384b SHA-1: 731c9b4dbf51b643570bdbc4657a8a30f6288f8e SHA-256: 94f836bc0fcaf3debbca6ec7cb04f63f19b15d5ea74ed0370fc51afc09ee68e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with single links, suggesting a tactic to distribute malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=android+10+switch+between+apps PDF link annotation
    • http://kaupa.cz/userfiles/file/mijuginawijexozejo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/39208818016.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/lomigudumudi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd8189c12a---rodew.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/15182750975.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/satotedavajem.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/ruvumozusuwag.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/75414455497.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/xerifugagupobemuwutomezu.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/guruloloburigirojevuje.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/38689365905.pdfIn PDF document text
    • http://bulmarconsult.com/files/fabipogumixojasojivibunej.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5b8655b6---nuvotutusobo.pdfPDF link annotation
    • http://guitarenko.fr/img/files/99786351324.pdfIn PDF document text
    • http://www.buildonhope.org/file/fitibitorisunitepodutiw.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/503bdfb58ce0a06a2af49d62e8da13fc/dasivot.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/zobofavezifavenurufole.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/92757500755.pdfIn PDF document text
    • https://rippa.pt/files/file/tanaz.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/gazivunatelaruvebanefewa.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/92122577016.pdfIn PDF document text
    • http://sbcnepal.com/images/file/21644286209.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/gelagufiba.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/0eb3uep7mdm8s9e1obc647r7j7/junoduwavokiwelizafo.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 17180 bytes
SHA-256: 27344b2323823394b5a4807e65b02ea5a37550d44f89823d07fc775ab426032a
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 10944 bytes
SHA-256: 958983b1142b99265049f32718acf78dbd7ce0d120198c3c17ad822537c33b6e

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