Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac299753780a6c6…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 19:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e17900bad0721aca0101a31dca4c3866 SHA-1: ce0d793590fd1c9087c1543fddc4ed64024fc449 SHA-256: 7ac299753780a6c6052be105e40b99f8ba20123ca9484a2d96bfc9886f4b994f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading or interacting with harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16076f858407a7---tegizinutu.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c642553e7b0---fufaf.pdf
    • https://nhachoxebus.com/upload/fck/file/93976397094.pdf
    • https://attack.lt/images/files/nejopefafadowewatefoxolex.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/79b98af53accfde57176ae41042f6c93/5516655425.pdf
    • https://ville-saintleonard.fr/pdf/zisiwewepataj.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160856eeee91d4---89668179346.pdf
    • http://gazosilikatnn.ru/uploads/files/42400021348.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/vevag.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ijaft1ognqi5li70pf5lbf3ntf/40981846394.pdf
    • https://cupanghitam.com/contents//files/92865081499.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i5s7fqc6efc59p62bpvl8jnaob/59852012441.pdf
    • https://alutat.com/data/file/37436827943.pdf
    • https://nexusmediation.nl/files/rofeboxamir.pdf
    • https://inncredel.com/uploads/87417595179.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160df5e735b892---72284645181.pdf
    • http://lezeckastenakosice.sk/upload/files/viziwajafefatopitiwekoji.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a610aa56f71---95563700622.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/83447613502.pdf
    • http://okmarin.ru/userfiles/file/80813573765.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/zanazamixetamit.pdf
    • http://sardavetri.it/userfiles/file/zifijomewujatovigexisale.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1ca7f618ff83ffbca5f97c0b105beb86/76584715230.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3df82181---zajepegonup.pdf
    • https://room12shio4.com/contents//files/libexetok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=social+media+marketing+strategy+template+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_off0000ebfd.bin
dea8a248729061ec3f5f6dd26db123fe59e535da5bb3d7f17ec28801985e4a94
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 18396 bytes
font_01_sfnt_off00011c36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 16792 bytes
font_02_sfnt_off0001344d.bin
54fa7e5df8e0ef49cef388253f260c0bfc5040efdd9e614e3de5125692864f09
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344D 11244 bytes