Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf7beb334126595…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 14:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55ceac41550b8ea773a728f284f0092e SHA-1: 79ba42537cb4beeb7d5935823d0df4eadcb1b68e SHA-256: abf7beb334126595f9d14518e624b6dcd346ef36099c99ecf1750528ac21632b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates redirection to these malicious sites, which are designed to distribute malware or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=photolab+mod+apk PDF link annotation
    • https://brakos.it/file/68643565902.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/80675062446.pdfIn PDF document text
    • http://sin-hua.org/userfiles/30212254755.pdfIn PDF document text
    • https://profesa.net/userFilesfile/88980160516.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/33632937998.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/84233004540.pdfIn PDF document text
    • https://kaimano.it/file/32934350607.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/75474532418.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/19781848068.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/74005887569.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/lisiteramavefaf.pdfIn PDF document text
    • http://szm.hu/userfiles/file/47708209125.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916102237.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/17450946970.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e60db97be---50524145946.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_163507.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nozogivasi.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/34042001051.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/030e2243b53551ff217528cdf4841483/79556125112.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36bdcf146---susenotuwenemeziguli.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/talapotevaxenowawepapa.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/kowawugiwosutovolexipawax.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/66950389904.pdfIn PDF document text
    • http://envigest.cz/upload/file/83781882397.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/19794913394.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_off0000bafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFE 15448 bytes
SHA-256: af4495710c67530ffd434becae5d1a5e2dacab852e2620d36f9c9b390ffb1256
font_01_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10292 bytes
SHA-256: 005db17ce2997ede57be18fe84c5401c613c95a9ce0489aa92f2c3eb394a5bad
font_02_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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