Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da6097b996b3d3e…

MALICIOUS

PDF

92.1 KB Created: 2021-07-09 01:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f14cabc89e6707e6afcd61ef80543368 SHA-1: 87c906d2a12fd2c02cab2db0dd483d732f2d8610 SHA-256: 9da6097b996b3d3e60ce8deb1d4d4d2cac068ea7a74f7da1dde77a830a9246ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, identified as a link farm. This technique is commonly used to distribute phishing content or redirect users to sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c9fba7d532e2116f4aa56d5b9aa95a71/62214571546.pdf
    • http://lev-steklo.ru/userfiles/file/33333645708.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10245b4b73---35114083253.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0f6cb73d---13772573691.pdf
    • http://zulassung4you.de/bilder/file/juxetuwipodimugimubaw.pdf
    • http://sitoad.com/bbqjoekey/files/202106200645518944.pdf
    • http://www.look4job.gr/images/_user_na/file/22761797433.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a14586d6e---44064250561.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gevabirafufozut.pdf
    • http://samafb.org/uploadfilefiles/16025835319.pdf
    • http://alexandraharris.com/clients/36054/File/wumixagewijexu.pdf
    • https://airbays.com/userfiles/file/95590529696.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718ad43adb5---tewoguneb.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6686c6ff050afcdc3767958860fbe902/wevawemarosuso.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e51e2206917---puvepovinavizewulelim.pdf
    • http://kasargod.net/uploads/file/22024034289.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/82220352492.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5dbd263cbe2d213eb6df4c4b3a256710/xexenamodifonifitovom.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771e6778d54---54556306646.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a573fd9b154---jovajorazewubute.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/go1cd3i8k35hm689oclds7da4d/48069833098.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apa+lit+review+outline
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff6.bin
b7e258b6e04a5deedc8bba0ee9f786baa55aa84e079f4c9e9b0b210914d233f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10308 bytes
font_01_sfnt_off00010765.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
font_02_sfnt_off00011f76.bin
eb322746d3ac072accb1c1a7b45cb2045771cccdb816429b7739c844d361bbfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
font_03_sfnt_off0001377d.bin
76ce9255d658a37ee81e8933b353245a51d73c8a28a0c5d097661a423d359454
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377D 17072 bytes