Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15d85496087b1d6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 15:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08c1f140982b138f9f35e614cae5529a SHA-1: fe07459353c9cdd786ab4d50a0dced553bead206 SHA-256: f15d85496087b1d6e6ba1c1a5ecd812c41ddc0b3ec5971084c0dc12efde5fb72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ML classification and ClamAV detection. It functions as a link farm, presenting numerous URLs that lead to compromised websites or potentially malicious content, such as pirated movies. The presence of external URI links and link farm indicators suggests an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.mattig-accounting.bg/fisiere/file/lagawikoxisutivopojisaset.pdf In PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/lopelivoka.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d5431547a5e12ec93ff749757470c64a/notiguzilalujolaripigu.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dofopusesozikokelumob.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210905155220.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/zenobapasepisemijenoz.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/58111016548.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/15292282807.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8488969927.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b5e98062---18586655387.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/60441858447.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aba0acc0132104fbfa01145d6a400bcd/54368778252.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/83238150426.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/tukudumerugimuxunumijexo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/54gm42la77vo7ktfs984h6h057/jajijobipis.pdfIn PDF document text
    • https://webmenuplus.com/images/file/veretusuduzotojomasuzuzor.pdfIn PDF document text
    • http://aven.su/userfiles/file/13116989395.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29427815547.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/guzotejotitovilo.pdfIn PDF document text
    • http://stattus.com/assets/file/favusumumuposijuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tamilrockers+kannada+moviePDF 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_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16884 bytes
SHA-256: 66dc4db9ebfbadabd8839fecc0a78ba9f2705721148a7db6b7d86578f71abd61
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 10556 bytes
SHA-256: b75cc4b8eaebec050cd022039bac312085092b9c06afed3ecea04cdba70923c5