Malicious PDF — malware analysis report

Static analysis result for SHA-256 831dc8ba968bff86…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce30fabcf65c9dc66e47c5864b0a1216 SHA-1: 6fa3c35c1a51928c10c03b9315a940618b9ff775 SHA-256: 831dc8ba968bff86f3d9a3fb576cac140f56999d7a7368f0defc58a1d9b1ef20
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a remote support tool lure. The document contains numerous links to potentially compromised websites, suggesting an attempt to host or distribute malicious content. While no scripts were explicitly extracted, the nature of the lure implies an intent to trick the user into executing further malicious actions, possibly involving remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d6379fc8---sorezoj.pdf
    • https://loctra.net/userfiles/file/97527017174.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c981b274e1---67465276084.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7936ea6f---36217223009.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7a76f7e2---lirupebi.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/163a11da59bee61eddad343d423097b7/tuxevedefeduxulotakuz.pdf
    • https://soudurelauziere.com/upload/editor/file/52229420809.pdf
    • https://faresaldabbous.com/uploads/files/30551495726.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bl16693umnrm9kkek2q7svdfgp/26948307420.pdf
    • http://benthanhsgfarm.net/images/uploads/files/nezozitagopimilor.pdf
    • http://el-master.ru/userfiles/file/xopumavex.pdf
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/56891034919.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160901ded0ed0d---14156543643.pdf
    • http://qiangka.com/ckfinder/userfiles/files/mirokipezawedone.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608907d881720---10885656438.pdf
    • http://www.kilincsweb.hu/fileok/file/98534216885.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0dee50d1---tetudojetepopimabisumela.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a61c6ed63---55703091445.pdf
    • http://agnieszkapawlik.com/userfiles/file/remitujena.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94c24be42---85418216114.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0hlcc922mvtjn5cto86ds6id0a/42670994142.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbff30861e---96631887336.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbdd2573c7---ramebixopepiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=perimeter+of+rectangle+problems
    • 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_off0000fb61.bin
c41589d832f611090a4e16d1a99b17093ae72e20d5aca55f943a2cb429383924
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10964 bytes
font_01_sfnt_off0001149b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
font_02_sfnt_off00012cad.bin
4208263ee1b0398682838182ee56cf5062731a018f2c306deb80b2dc3e8537f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 17432 bytes