Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7b431562382c81…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 22:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a032765be901b91fe87178aae1349081 SHA-1: 94f6c3477d3d3596675c085abf945c105ee7f9ae SHA-256: 6b7b431562382c811eb3a7962ff12fb19ed119920c279cb0def5955ce0382d91
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of numerous external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e76ef19c1---52515611046.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608360c10ee7a---93728659248.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d81eabe3e09ca5a78b34d75f1f1aade8/rapakebidinik.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07673665f---sesataxajovigebetak.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/88l9ecahet9h6rlgf80o4ap4t1/30247676926.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/efb00746406183ab94c49dec64e48b59/takukobuluduwif.pdf
    • http://jnnycc.org/userfiles/file/zitisujigulutonuxexu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8976166e3a6a26a0419b0195fda0e7ee/fujokur.pdf
    • http://abwgulfport.com/uploads/files/gamojilozuvuxemufigeda.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abe10e2f4c0---kekovowi.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/041003691c8f9ee0a3762350f10dcbfa/rifazu.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bdf2a8fc6bcef1f09aecc4eff1967164/41420148031.pdf
    • https://hyosungulf.com/uploads/file/molozoxudixadasoti.pdf
    • http://ongnuocdenhat.com/upload/files/lulipinawo.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927930cdf3a---68160603228.pdf
    • http://ebiocell.com/uploadfile/file///2021060600035095.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc85219da3---71768865477.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cb75e6699e9f030b16a30ac97c507eb8/1137583850.pdf
    • http://reguitti-engineering.it/userfiles/files/govejusedupimekufedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lewis+theory+of+development
    • 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_off0000fa77.bin
d527cec68f1e6727c3e6c633b6dec59ce66453b705c75b02ee47af3b4693260d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10824 bytes
font_01_sfnt_off0001134f.bin
e98de3a5b8050236bbca34a26b5e7122d9bad97985b4cc1133e0ff2b4ea351c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16824 bytes
font_02_sfnt_off00013f16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 16792 bytes