Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f6db463f74aefd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-27 21:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d728063e46b912d2b4e923a6feb4132a SHA-1: 8b266f4f0c8f277372844e7a3dc55f819f1242d1 SHA-256: 79f6db463f74aefdc663b7d3c219854e3cd1af357a45dbecb0595899900f15bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=3d+animation+maker+app+for+android PDF link annotation
    • http://garage-ys.info/js/upload/files/93658364601.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d5df3dd202cbb3b4075120a373df549a/74095425005.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/vawuxevapedawabakiguj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367eb3cfcc3---jozejekezorijadeti.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210914_DAE71F37253A9CD4.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/guduguxavovaxabadixemeg.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/minobasef.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jowos.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/51443958106.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/84756285224.pdfIn PDF document text
    • https://flomogroup.com/upload/files/94930731771.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/pipev.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/2654856765.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/55292144181.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb52bda5b---sajirupuxilirutazegem.pdfIn PDF document text
    • http://oodow.cn/upload/file/210919230558283683tsmk6mg14ni6.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/zofeda.pdfIn PDF document text
    • http://cochemical.com/upload/files/menonojosiwiwupunij.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137668771f9a---33446492671.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144bbf8b2d46---wepopuwutudovan.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9a0e090fb22f4f40b2c11308ec6c7b0c/dotozetixulivadiw.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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 18436 bytes
SHA-256: 7feac33bb0d55d2685cdcf65484250c6cd6fb401741d5046e3e17d6e9297784f
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10612 bytes
SHA-256: 59beb77c45d19cc8913d08e4127d6ed921309162a4f84348a0fc4b5946929dff

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