Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b21c1f152204377…

MALICIOUS

PDF

98.6 KB Created: 2021-09-16 02:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 860c5c914ce3fc750a719c140b33c07a SHA-1: bd4db8bd470a6e5038bab9cc0cf8a301c15e8c33 SHA-256: 2b21c1f1522043774851476afa570ddf843c698210cee58bc206779729b39a57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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 https://philabc.ru/uplcv?utm_term=truecaller+apk+gold PDF link annotation
    • http://jn-zhsc.com/upload/94470435070.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75a945463---pilos.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zerabisatidenakekin.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f17d1a10---5727551272.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tixifekifokovigejenuj.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nimafomupip.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/91600516970.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/89824873030.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/xudiridonogukuj.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/zubevakativibapemova.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xevitetazoloniwipiset.pdfIn PDF document text
    • http://davcpundri.com/css/file/kidexe.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/49419901655.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/99135281658.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9kf2b1jqbg2om3rlki6s9elh5/96030424043.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/runuriga.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/11944235223.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/radutowizilenadi.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/moregupidorut.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613646bf224a6---7059953424.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/rusebevixup.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/gotazovuletemabarovuwatu.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/tujagoted.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/20716354920.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/49074072196.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/zujugoziserodixaleguw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10384 bytes
SHA-256: 2fbf234997cd9ce2da020fc11d3e372e34492e4fb327fe3d3264c9d76e9b881b
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 25908 bytes
SHA-256: 71dd7614d898a0dffb76d88b808c0e63b0b2a30b83a5d63e4424e83af5e696d6
font_03_sfnt_off00014d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655A 16316 bytes
SHA-256: 240e91d3c93f322874c8ecf578a5ed642992a167f318b37a8fb03d157e744a92

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