Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf6525c84c7166b…

MALICIOUS

PDF

72.5 KB Created: 2021-06-30 22:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c79a8e05291091c912b66260d6ad81c SHA-1: 6fb0cab6d9826e9bda6aec5af0dc63ca55283214 SHA-256: 2bf6525c84c7166b6f21dba0af97dd724521700e818399b78cbf6bcec12b464b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839f56b41a5---zijinugimenopibemuronopop.pdf
    • http://zonazero.es/userfiles/file/15132067873.pdf
    • http://frangarcia.eu/upload/file/78896697468.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836512c782d---78820443899.pdf
    • http://www.pattyn360.com/upload/forum/files/28231371565.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947770e4e40---50614766580.pdf
    • http://caythuocdangian.net/images/files/kolevuv.pdf
    • http://lucann.com/Upload/file/14711570780.pdf
    • http://www.biotanika.pl/upload/file/53069723618.pdf
    • http://homelife-superstars.com/image/files/3593156522.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ht4h1lfcrbarqadgpf81ejt094/38864541342.pdf
    • http://vce34.ru/attachments/file/76907849085.pdf
    • http://moristas.com/userfiles/files/82450845460.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3413591ef193e8802c626b7ef216b177/pijamafasavibifumimevo.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48197467372.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/mapan.pdf
    • http://accronline.com/userfiles/file/12584802887.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6b609e81---92967254859.pdf
    • https://aawyx.com/sites/default/imageuser/file/fuwadevove.pdf
    • http://darec.sk/files/files/jivikulimikuluju.pdf
    • http://interiorconsignments.com/media/file/pelajekuravoga.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2318e8dc31ad945162a01d0698308e3d/mawibamil.pdf
    • http://mousike.it/img_ins/files/79884857516.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s9899u22f6s17p4ig5m709u7a0/wojet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bus+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be2f.bin
e9d643de5bada623dd14903365410e7c2da5ab3d96bee527278ad2ab5674e05c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 16368 bytes
font_01_sfnt_off0000e77a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
font_02_sfnt_off0000ff90.bin
65cf0433b546823c2feb0810d44afbfc485b4beb1ee639141a6becbfb08fcc5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 9856 bytes