Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d692004df99f9ce…

MALICIOUS

PDF

95.7 KB Created: 2021-07-03 02:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04a925e1b66fe43190f665c6e42b9eb6 SHA-1: dedf4de6535dbc9a44d2d01a05d586bd2d077d8d SHA-256: 1d692004df99f9ce4a0213fe277a1bc18dae82aa4d14121126b8b8f606da03f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. These links are likely intended to trick users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, aligning with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1730b948---72771484472.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/mo4ohe80uqli5mtnipk6ar6ren/josuxewiwera.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de8dbec38---wajerezazima.pdf
    • http://alexhoffordphotography.com/temp/files/file/masepasaxilusijadise.pdf
    • http://ceomit.com/fckupload/file/pizefanegonedab.pdf
    • https://inncredel.com/uploads/pusigexazavomugi.pdf
    • https://tmtteks.com/files/33705119890.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c132b2a906b---74433000786.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442355c2c7---dawavolekowaxosemof.pdf
    • http://uniroll.pl/user_images/file/werefegana.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b71765e27---razesepagovodijal.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0a4be117a---15475254061.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fe2e5f0e3---30370561904.pdf
    • https://kund-in.com/userfiles/file/lefufi.pdf
    • http://gakuso.jp/image/_ckimage_file/87115172735.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a430be6b0f---52499043904.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/23184121547.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b46b1b48a---98778026752.pdf
    • http://info56.ru/userfiles/file/37934595206.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/761654297d99733bb8cc9190c3a19eed/1217198406.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/72231980703.pdf
    • http://akicgiyim.com/userfiles/file/nawapijujobugegok.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c03d809b4---67472083458.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099de52b9411---31578654588.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d3b3d4ebf3f275a474263cfd1aec8671/zivuloxususo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=zip+code+for+galesville+wi
    • 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_off00011363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11363 16792 bytes
font_01_sfnt_off00012b75.bin
8310048cb8114edb41db86e401718cbfe65064bae5d470888f933645e04b86f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 17152 bytes
font_02_sfnt_off000158c7.bin
495b65a7ed85c91871dc391c89f69795140e1d2e06bfcbe5406a130fc942d245
pdf-font-stream PDF embedded font (sfnt) at offset 0x158C7 10708 bytes