Malicious PDF — malware analysis report

Static analysis result for SHA-256 313f1074212ff7f8…

MALICIOUS

PDF

91.1 KB Created: 2021-07-10 07:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86c117676821265890c6787defbfc923 SHA-1: 8a91fd97f253a391c8edc879973b4422db7ef0ee SHA-256: 313f1074212ff7f81fea94e939abfd0327eb8aa5633b73b55cb2a3ac83465b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2fa35896---falaxiwidagusazabotob.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofanesavoza.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nr7hp27mktmfs1atilhr3toqgn/92434609269.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e2fd2f5e---wopubafaxewo.pdf
    • http://nceed.kr/pds/userfiles/files/66012850894.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/285015c0771af7c3d04125d14b992734/difijas.pdf
    • https://aakritidigitals.com/userfiles/files/37428878930.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ffdb954b2d2552f390fead089be36f72/dozuxujarijerirefem.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ba84f9f12343bae978ddf5ec86ba32d4/89220856291.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vk57q5tk140svlnkd8t92ln59b/10924938009.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210708_08AE08FB3BC1D686.pdf
    • http://dermaktif.com/imgup/file/busirogorutaxewob.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59aeb2c57---vodedama.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080040f8fdc9---19986998826.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/50858785207.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160be153d29742---95545182595.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/68890050951.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acef9572f9---sirexoxux.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/dd7c2582d8095d8e489efb846fbea04a/nitanud.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59385543951.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/ronatafipogifezez.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6d75fa374cd8ed868a90f2daf101f2cd/3378202527.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7c5449aea3ee7b8cdf2bf767bfe31ba3/34952484826.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2654b4f8dac9ee7535c04a43754e3fae/dawazoradenovibopuser.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=9+from+the+nine+worlds+pdf+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_off00010331.bin
f2a9e46eb62b9cd7c3bda7c9e101a8204cef1a2937c08ef0db35336d64fc90d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10756 bytes
font_01_sfnt_off00011bbe.bin
db2a13946382fcf6e27556f9e97523db23211ff4a0a971c7f6e90d5acd8b29a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16560 bytes
font_02_sfnt_off000146d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146D8 16792 bytes