Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bc80cc839a5df8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37adc959582fc8b5078e0ea59a8a1ffc SHA-1: cb4b41031414d1621e0b1ab7236a049f263ac369 SHA-256: f0bc80cc839a5df855a81a6f8fbead30335147506038d2846db2f69d45b5e9be
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc1573b1ce---18810644386.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613641610285a---64680146798.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/95732626744.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/84798201862.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/85134622836.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf424243d---xetudujolosujejuwelo.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/12776918616.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/vegiwo.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/65344750011.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/wefox.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/vikaju.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/figezumenarigoxe.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210912_44A5FBDD91638DC2.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/refuwefegoxodiva.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbf8cf9bfb01aa44442a3afac16d70e5/4447580131.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xifedazotusevagoduma.pdfIn PDF document text
    • http://dsagco.com/Upload/file/62500546001.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398358a50ae---jukadajesudaxarawonaputo.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/23202353393.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/11293966808.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5c2baaf846bad0517f068047a54454ad/gizirebafek.pdfIn PDF document text
    • http://abofahed.com/userfiles/file/31106260170.pdfIn PDF document text
    • https://photojet.net/userfiles/file/55281052461.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/tonuwado.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/80900111712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hack+for+only+fansPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 18904 bytes
SHA-256: e93a81cda5824f506343a2eeb737276bcbf47cedf4eb0338e387f73f8f196a49
font_01_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 10204 bytes
SHA-256: 162ae86e3dbe9f1aec211e0e329c4efe25b8b089d41868964568f47dd168d15e
font_02_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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