Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff5611913b20f2a…

MALICIOUS

PDF

106.1 KB Created: 2021-06-29 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0f278b201cb6a0d9b50de2ef155a67d SHA-1: 78b90a763b6bd07f513959c060eb015f9534786a SHA-256: 5ff5611913b20f2ac2679893f62d0c03a519a116a47b69b31449e28210771dcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/dd58d9d570598804c14d843e46ed6dda/63957728567.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607496ea9596c---zowagilajofoselo.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/gakore.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/t3tq0lbqs0nki4483ll2r7f72m/papalatokanexikumiw.pdf
    • http://interiorconsignments.com/media/file/35061694053.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/gelevemelelaro.pdf
    • http://backupcenters.com/userfiles/file/57121381338.pdf
    • https://vannordenvastgoed.nl/userfiles/file/dafefamufa.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce37088c---49047167574.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9906a64a---bemabanerefibufagu.pdf
    • https://oddluzanie.net/userfiles/file/vuxezawukin.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b3a84b7fe7ce8be7410ae02fe239f163/44825902096.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160815be6f17a9---sapilofita.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/mdt5l8elmov78m3ehu82hqj1um/57736087851.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da780111433---57964583033.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/sulesapujesaxubomapikip.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c774b4ccefa---gejinonuvefafenegebujeku.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/popugo.pdf
    • http://imi.vc/upload/files/nipojaritaf.pdf
    • http://angelcabrera.com/FCKfiles/file/71621704921.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3li0h3ltbsue1n9iv7dvebisr/41245652366.pdf
    • http://biosurfest.com/userfiles/files/guxot.pdf
    • http://qiangka.com/ckfinder/userfiles/files/winazonawimaxazudomabezu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=eveline+questions+and+answers+pdf
    • 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_off00013b66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 16792 bytes
font_01_sfnt_off0001537d.bin
ea0bfcc0403457fba708261c2315b1ccf14d139cf44aeb88af1216c1a3e7c0f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1537D 10872 bytes
font_02_sfnt_off00016c8e.bin
2f98f0881ee905a2e851de760622dc512d007112174802439fc0c5e60e18b1c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8E 17820 bytes