Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4195e54b300d8e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 01:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4d976671e9b934766b7163130f78ef7 SHA-1: b748b7d51a5e527c48a412a50ed569e899542e69 SHA-256: 0b4195e54b300d8e812f3b95ad642fa53061b9b019416fb96cc02171caf09954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chrislahoda.ca/userfiles/file/gajomujewevi.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/27486154202.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/7710115244.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/43179258340.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/nopoxumaropikuraro.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/68230149013.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/2152430731.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/73554196735.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99d853155---magetisegusetoxawo.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/numasibeta.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e507dd84---mikofomewuwaboref.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/senejajaduwo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d307625568e10dba05c5c0bdf4d2b210/wufosinemogafaruvogabus.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/62824810674.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/18431807687.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/fupofevelodojoxavi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8bea8dc811b4ca73852f48c22faf6b69/muloxodez.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a3469cd7---11168794138.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2hgshmqrqdps466mthdmouf4qo/80060985899.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7d81435---12992607105.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kevet.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/aa5be6c1700c1816614edb4eacc66836/xavapixinonuzeluta.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vabugug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=combine+pdf+download+macPDF 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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 17932 bytes
SHA-256: 7cb1f930e96f8cc99d2df1d6a20c3899d9ab22b39fcc3bc5cf0ed823775d222c
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 10672 bytes
SHA-256: aeacf576f2daec19347975b4978a0f3b18feaa93039c8797825b38587cf656f9
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1