Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea917feee8117968…

MALICIOUS

PDF

93.3 KB Created: 2021-06-25 15:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4292c4d40d9ecd1dea9d08d43a138d3 SHA-1: a3ae16cb5a40b2096b5e4d55a61063384e351464 SHA-256: ea917feee811796821f0dad3c71dbd4ae76a661f761de203d05e5362740ce3c1
96 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 targeting upload directories. The ML classifier strongly indicated maliciousness. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/746a68b408502f53682a0b99bfbe6cbd/muwuvodup.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081432ea28ee---97393714614.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f40e0a608---lininilubuditogibitajig.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r95dsnpk2n6df6uk4k5vkn2v4f/99598759524.pdf
    • http://epoxidice.ro/mm/file/fagegidirife.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/af2319e373ad4b155af8b81ebf1420dc/6415116390.pdf
    • https://247hvac.ca/fabulous1/uploads/files/laxizawadaruzujik.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47d7c2db8---bonunemupap.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9f9cdcf9---28551040255.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8132ccd09146690fc81a1df50cf9cabb/96641337424.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee76d0293f---53798118122.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/18bb5d853939f38b9b4586cf79ff6940/naselonev.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bab5c480d---38089737630.pdf
    • http://www.aqsclimited.com/EditorImages/file/sesirubibisogogoxuwagebo.pdf
    • https://balajitutorial.com/admin/userfiles/file/86756274200.pdf
    • http://dobrasekacka.cz/userfiles/file/23021607055.pdf
    • https://mosallaesf.ir/uploads/ck/files/27875202720.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0c87899---24089775857.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=holderness+family+greatest+showman
    • 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_off0000ef95.bin
206cfe197da5bf1e9925ad41ccbadcb51514694dd6ef3003f42fab583609e827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 10992 bytes
font_01_sfnt_off000108bb.bin
967348400c7eee4a14b84f330412737fd619aa34462bd190ad2e49d5831a9a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 18844 bytes
font_02_sfnt_off000139ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 16792 bytes
font_03_sfnt_off000151db.bin
adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151DB 16336 bytes

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