Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b36d7fb2a3df95…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 00:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 430771fdfc6052a3e3467083f7d0c5b9 SHA-1: d398ec09214950cc898682df5f975f99147b7360 SHA-256: 65b36d7fb2a3df9527be88b40bd8b46acecb2e7a52dcbe699bda1e2a8296721b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further 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 and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d14a79882b---46969886655.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c392e88592---96433212336.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/60685730654.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b6802a675842e065522d22b18edd49b/bibuwunexifebadadonu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oks9ia7rkt4n7v2k98lc02ecvc/sevizoruvizisa.pdf
    • https://istocdukkan.com/userfiles/files/18533160959.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4c4ab2b47eb8fe59d050a1d8d2abffca/76874950261.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f513dbe825efd4a7f689d9e5983b5185/38842191862.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/46517918989.pdf
    • http://ahxxzx.com/userfiles/202105/file/49434924274.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f72fbf4cfc86cb761595cdd18ea930e7/zoxodagijokira.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed06bbaad---23993024229.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c31fb9454155da4c2d3f69a2a0bcfe1e/xaronegebowilotufimuluw.pdf
    • http://crmrealty360degree.in/userfiles/file/guzutorovoginegeni.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f888f42162---tumixatobaturuxa.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3569b52d7---22208136532.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8374e5c40---82394634155.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991d84adb---22173541064.pdf
    • http://inspirationforexcellence.com/clients/66491/File/jeresozenenepinekol.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/refoketavupuwanexaxugurib.pdf
    • http://marthomaiticherukole.com/userfiles/file/1577636669.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=prayer+to+release+10000+souls+from+purgatory
    • 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_off0000f9fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16792 bytes
font_01_sfnt_off0001120c.bin
754d1e28516af218d8c9b93a0b4988033deea8b6b48a4ae5a03ced0e7cf94e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16728 bytes
font_02_sfnt_off00013d81.bin
dc2434397ac47c9638cead40de37dfcd9b081207d6303eec080a3e95d2eaa98f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 10896 bytes