Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb9aa1af7bb245…

MALICIOUS

PDF

99.1 KB Created: 2021-07-07 18:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89c924a6eba53043f9e52a4c4642abf5 SHA-1: 68756b150550f4d252f6ec96f9e26ccf7f821c19 SHA-256: 6cfb9aa1af7bb24529bac52baa430c3bb9b33a76346afb3e84d145d1a8872d73
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating an attempt to redirect the user to malicious content. The heuristics suggest a lure for payment redirection or a password-protected archive, common tactics in business email compromise attacks. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conservativista.com/js/ckfinder/userfiles/files/86820946802.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fb8c2f3bf1e78be68d7705124f26ff7e/pefafewaxuzotoveve.pdf
    • http://er-trans.com/img/produkty/files/kexitir.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/5890517498.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ma2gam3jm2uc86gcfrrf7solur/78048572523.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7ce20907a75f4a6c57edf612a12e25ca/patefijovoxikavi.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/n1mlgqh3offoi56gj412etko53/zutavobafenojijodaro.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/71165806553.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/45d4110500cbbbd9f66b3b4154c631ab/xiket.pdf
    • https://agrilaui.com/userfiles/file/60076186807.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3446afcd76ee4a8f1ef31b74685b9aed/32457910680.pdf
    • http://cuacongtudongbinhduong.com/upload/files/farisisibuwoseb.pdf
    • http://bigcool.net/webroot/img/files/fekedilozemanutisoguxal.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d692136b4a---verefe.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d0f80ebdcba69d646d754bc8a489fc18/wevirewijovaxaluxuvog.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/4p1209nkt0516cpj455qg5srr6/duxitubarubig.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/2628177842.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3067ce33---kafowibatujesem.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a89383b6f8d595d26155a2f53a3f259e/tutirubemonanajigiru.pdf
    • http://designpavelzapletal.cz/files/file/53200779481.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e1b84bed---68045667224.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f027e9c78---21643282369.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/275431a33e9b961e188e1566ac7cbe33/luxaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=protecting+yourself+from+fraud+worksheet+answers
    • 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_off00011bba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 16792 bytes
font_01_sfnt_off000133cc.bin
be9c3fc3e00a65bdf24c19490fd15efdd4d5deacaba874f0d39e5d6067cb3f9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 17944 bytes
font_02_sfnt_off000162c1.bin
a5231e1931c3b39312b3c4619962f47b507127ea660b3aa9c064da34cb3feda3
pdf-font-stream PDF embedded font (sfnt) at offset 0x162C1 11316 bytes