Malicious PDF — malware analysis report

Static analysis result for SHA-256 f769de797e6028f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 03:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b79b939157258479b74500a6916875bd SHA-1: 2b51a2e4d0fdc18414f5c33917240e5d83eaea49 SHA-256: f769de797e6028f0eaa8f50bbaca88b6b9f86fd121706f0b7e8a8def8bdb2949
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://ayurveda-shiatsu-nice.com/upload/files/11247686552.pdf
    • https://kasihpaham.com/contents//files/malimogudidotuvolex.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814b28039db---tezukisevazafoded.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/42044b618e231b1b10c5cb0480867379/timaxejapawajefiginusod.pdf
    • http://haiqi-machine.com/d/files/4818754598.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a769c6d77---47407663315.pdf
    • https://gulfb2b.com/userfiles/file/31767702439.pdf
    • http://ajivikafinance.com/userfiles/file/nuvevitavemodofibo.pdf
    • https://hurghadalife.net/userfiles/files/fofulavonulemeva.pdf
    • http://huile-de-nigelle.info/userfiles/file/xudujosazo.pdf
    • http://clinical-pain.com/pds/userfiles/files/38410146954.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9cff3e83---penotapas.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b50a6c27---duxezegotaverefepivoz.pdf
    • https://angkorphotographyguide.com/userfiles/file/26102693521.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/11786179908.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/93671332185.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96925ee8d6---nokigojukewani.pdf
    • https://realxenon.ru/uploads/files/jinoxevil.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t0ere019d42e2edjuhojliuoec/kefapikokodejajowovovelu.pdf
    • http://packturf.fr/files/rulepowelavepexuwakelexen.pdf
    • http://beiwendq.com//data/attachment/file/53554591296.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d697c10df1b---12567004934.pdf
    • http://ghioroiu.ro/sites/default/files/file/nozuzere.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210821023423.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coreldraw+photo+editing+tutorials+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_off0000d9be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 16792 bytes
font_01_sfnt_off0000f1d0.bin
4994806246e1442d416ccfcd89691e13bc27b92b8346f3c42c4d53764fe635f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 17708 bytes
font_02_sfnt_off00011ec6.bin
10db0310f6033905d687576e1108998e73e5e3d2259e2be90ca4cb1f6b7ce9ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 10992 bytes