Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8abf5ecebfa0a6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 11:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c011a505f54714310e1c10ea713d83ff SHA-1: 38029a1bc4a39fa5afa98be96d6b1985bab7533b SHA-256: 7a8abf5ecebfa0a605c9a09e518f06a4f5dfc535586273ae203f233a09542ba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=d%26d+mythic+odysseys+of+theros+pdf PDF link annotation
    • https://ww150006.linebot.net/upfile/files/20210907061332.pdfIn PDF document text
    • https://eklyps.net/images/file/ziwogajol.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/33453661923.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/rosedoxabapowi.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/86595759525.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee5a21c863249ff45d87e020eb613/86047855608.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c3220ac3---sodazetadevigevobuwutig.pdfIn PDF document text
    • http://juha.be/_files/file/87734992689.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vosegibu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/22368840377.pdfIn PDF document text
    • http://schokofontaenen.de/idata/34439367219.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/15323954941.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/xivuremaxodu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/336522eea79bd390427fe3aea5ae6683/72379355018.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7433284225efe9ea3ea3baf8190eee77/67705430281.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/fedoxotexaverip.pdfIn PDF document text
    • https://22importexport.com/eimages/file/ledesubolozowufolofoti.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47966096415.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1399ca531282ea3d73c2436976a4d0a4/12050267563.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kadozidaxuseri.pdfIn PDF document text
    • http://www.77ice.com/upload/files/tifolidupeje.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_152152.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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 19340 bytes
SHA-256: fe0cbf11b0fdcca758228928161cd3081c7ac6f1e0a3811f38928920dd212879