Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a8192b67cc7c6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 12:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 77076fff5c61349891b71be4d07af606 SHA-1: 1df3e068d53c3fda8af6ba76cde76d956547078c SHA-256: a21a8192b67cc7c658fbb74d67291ebfa79064d636570d52fb9278e47aa6ac24
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to download and run a secondary payload, aligning with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://ketchas.ru/uplcv?utm_term=pdf+reader+and+editor+for+pc+download PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161471bca3afab---luzebiki.pdfIn PDF document text
    • http://mobilenmr.com/files/files/4180324581.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/kokelomozuku.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83267faf9---54846213343.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/92335623447.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914143318.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f8970244---kimogopajexibovo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wakeloz.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/newawojofelojijidis.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jatuzazuvit.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wewimago.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/91401496870.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nefajagurobiworevevor.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/vefubusepumorunemilasemar.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fusuwawarisuripemepotosel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328be10f3b0---49066869986.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/susotanese.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3feda9ed7---48763930790.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/99488931470.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/89387220243.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/jasagurinuxuva.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/xufunabejibakivesison.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/gisotu.pdfIn PDF document text
    • http://i-physiology.ru/upload/lubibabogomog.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/16851805853.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasaderew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 10532 bytes
SHA-256: 8474654420d805644891da2fc8415bcf028a3da687466a4a67f0b3e7135a80bf
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 18248 bytes
SHA-256: 73c2f70309484ac56c2b48c69119b80a41416fc75c4e3728d412d4de7dbc0fb5
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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