Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2b839cdcaf6d21…

MALICIOUS

PDF

77.6 KB Created: 2021-08-21 14:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4dec6568f9d5e4527615a0656551b53c SHA-1: 8b07a424f88c924d97eeca98a3a4e1b402387114 SHA-256: 2a2b839cdcaf6d21fc4cac7069c500ee1b749afdab8c5eff2453deafd2eb5cc6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2855

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=how+to+regain+control+of+a+skidding+car PDF link annotation
    • http://gabinetortodontyczny.eu/userfiles/file/19551058699.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/71870495071.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084220ed08fe---vififenazedipitu.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/fatefifipazo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210611_160318.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/14841378955.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce48aa6fa---13594625651.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7d717eeca76d38bde9026cb49d8f0630/52978729621.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f09b805c1---gisowulijoripekedesule.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/fojrdpm4ddkjhtrs8e10msluhv/7965276864.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f1ef2ced4c6ca44a0b57c2834ec766a4/pabesexemezadepovibujetow.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f47d5734046---gusene.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/fofog.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a3f166---23198710578.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/93773539034.pdfIn PDF document text
    • https://viceda.com/userfiles/file/63912599497.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0631bf0793---55701502035.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/lalawizuvefodagaf.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/29690705811.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/50313454370.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210726_2D11F28BB7AD2DF0.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614070252746164.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1a0764d1---xoxarupamexolel.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d76d8a536---4664967772.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/dilam.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jkptdffv8tm1k3lh492sl2vatl/3255575599.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a635de01d---83951755907.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16508 bytes
SHA-256: da4985f6843b9bc9b8d78eb3d5b22a93716e36dc6daac4e95d14817916f45ba6
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1