Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43fe7342559839…

MALICIOUS

PDF

95.3 KB Created: 2021-06-27 00:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f9250321276a0c6eea867efbdfec9a7 SHA-1: 414b05d41f3742654d2828776617dd2a43939eaa SHA-256: ef43fe73425598390a1dee6b000358f38eb3ad4cd2eaa2fcc5d04a6fa473e033
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=to+determine+the+moment+of+inertia+of+a+flywheel+about+its+own+axis+of+rotation
    • http://yoron.net/up/files/vuxisexu.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/87119916109.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/komulejonuzizumopugiza.pdf
    • http://attlas.center/userfiles/file/puwuxefaf.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aa878599a500e1dc702ff435dc5093fa/bexatewivowurag.pdf
    • http://placc.info/up_image/jejajubipekozejejezalipav.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841734d6ea6---31531537690.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c4ffaddc21c942738ca3312a7001c14a/16122611898.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/83566083044.pdf
    • https://ms02bet.com/contents//files/vujegifegovunazawazuxopa.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/539dc39b459d268208b6e8b5d8f74a9c/80729103438.pdf
    • http://ampletrekking.com/userfiles/file/pevegokobasonazado.pdf
    • https://angkalaris.com/contents//files/82962789512.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093dcc4a6c48---53317179380.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b018295406c---xojabupafaganigumamezido.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bccb07c19---36096839645.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb8d7c152---96930329787.pdf
    • http://adabaskimerkezi.com/upload/file/vupirijiroreson.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed4a39f4bddd2fecc61b94acb287bf20/labujuposozi.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/64vlg80293bmpg0i1nl6uq4s94/28366870012.pdf
    • https://steammining.com/userfiles/file/tolabediwedikerur.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210623/0634201442.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762041b317e---manozolulow.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98877e92a---vizefesamotusikiroson.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2400c58857198b71b4a9fe3536109068/27109838000.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec13de2fb---64055632362.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79ac229fbd---93120823455.pdf
    • 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_off00010b65.bin
075187ce01c9cc651c1a5f16ae179029f7d013da995d3e0665889c532e3d3132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 11124 bytes
font_01_sfnt_off00012538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 16792 bytes
font_02_sfnt_off00013d4a.bin
bb503983b7287040878eaf44dc293864d296df7a000571d993a2d5061fa1d152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4A 18828 bytes

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