Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc71989dc4c6fb2f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 11:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0573184f1f5d1a9b9d414731448f9b08 SHA-1: c1896504627c822eaffdc2f41b2c73a5aa671fa3 SHA-256: cc71989dc4c6fb2f6e3462cbfd0aee28a57c39ee6469fa8256a93d875bd49cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, pointing to multiple distinct hosts, some of which are identified as potentially compromised WordPress upload storage. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pc580.cn/upload_fck/file/2021-9-6/20210906175002549141.pdf In PDF document text
    • http://www.sandipmallick.com/fckimages/file/76551965181.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • https://angkalaris.com/contents/files/pakiwupozifaf.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/36614464650.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/fisakok.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/neval.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/50836605888.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/01/jufagomafowapowukaf.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/nijugilimevotiraj.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109090110193765.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/rijimi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/fugosajakamozediwor.pdfIn PDF document text
    • https://parc-hotel.info/file/71861903270.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jokowoxigi.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/nukizuwolinazadibixofepo.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/sukiverufeguvetoxebomite.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab6b1663e---zaripiwarumimomenonuz.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lomasafipalomidubikulen.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907224323.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e1e9bb94---juzeguguzakewedogir.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdf760679---xitunizivojunijusuj.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/29900660109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+private+dns+automatic+settingPDF link annotation
    • 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 17732 bytes
SHA-256: 1fc06ba7a833b40fa95223846d48c0eb81a84c498ec8a0128beba51f669967c0
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10960 bytes
SHA-256: 5698a46cab26d8f3a4d44fd14650f19e412a7eeed6be7e71615ce3fc328fdb25

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