Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f349f14644891e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 15:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87ecd795049c24437123b6f13d320de2 SHA-1: 08bf1d20903aec36f43b532730db25de7b4f4fc8 SHA-256: 88f349f14644891e43bab552e54c0394099d7e7446a9c7fc09d09f4ed9522d2b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and size are consistent with a screenshot lure designed to obscure clickable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://614move.com/clients/4890/File/sasavupom.pdf
    • http://mlight.cz/archiv/file/82713476461.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/nevejurake.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9d5e72b9cac77a5e4640c1b9eb6785aa/mexonapisoja.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f8580d82---73273428873.pdf
    • http://quinta.cl/upload/files/49795252220.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab951c4989---nolokop.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ilame0ifvgmlsdr4mh3ctacr84/2149240719.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf9895ff60---xewigiwejazopopofov.pdf
    • https://aashianarealty.com/file/3040986066.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743acac74ba---96434183650.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7533ebb2b---raretofowubufexow.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df4d944ab7f---53799891424.pdf
    • http://airsoft1.ro/files/file/gaxagijikinurumuxonud.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/luzatanoneriwofetujogip.pdf
    • https://micsys.in/userfiles/file/79156572763.pdf
    • http://mnwebdesign.dk/userfiles/file/90484450412.pdf
    • https://soosekszer.hu/upload/files/70648792536.pdf
    • http://www.kickcommerce.com/userfiles/file/tapuzilogusuferivudabafaw.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa65c057e---torigemegiwopugoxebowe.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/pasiwi.pdf
    • https://vasantviharproperties.com/userfiles/file/bozomanusatukalan.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nt9co4ak5mjjohspdsmgvapcjp/15183289901.pdf
    • http://es-hanasaki.com/yamituki-n/uploads/files/nebojinaxowezesivifumege.pdf
    • https://yocarbroker.com/upload/ckfinder/files/xoxiserez.pdf
    • http://chikatere.com/Upload/files/10363939758.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=los+angeles+to+lompoc
    • 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_off0000b7a7.bin
a869c317567714229c2a05b78c71c06f2349212be4ca96aa20326e31ef1cb111
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 14360 bytes
font_01_sfnt_off0000db43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16792 bytes
font_02_sfnt_off0000f35a.bin
812966ae58c9722b9ccbe584b7daa5e28c883dbde289388f77212c2b0bb53cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10484 bytes