Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24905b24f8719f0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 09:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ce35427509e3b628bc3e0265b2b8e28 SHA-1: 784080a04d717a9ef29e2df3d73a7bae3730964a SHA-256: d24905b24f8719f0767263916bee57eb4685796d48419bdfc705f6f43f7a5257
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=friv+games+2 PDF link annotation
    • http://iaestedresden.de/userfiles/file/laxuwadupalire.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/mudekigilariga.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/bekibobukotuxinazajesexo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/maucqjj4jvfgi7ciou2rb1gtu6/roteneke.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/siloredaluwod.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/fijarogisa.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/sofodugedoperojineze.pdfIn PDF document text
    • https://tsolisp.com/files/file/fuvafarenabuboji.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/28073444777.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/23298397233.pdfIn PDF document text
    • http://autodilygood.cz/files/file/17488740886.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/wafabobimefowog.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/1627345660.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/17093227578.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/3449916068.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613234e24f45c---viduvawijidezafexujokobo.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/ketisir.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mubanulosesof.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tiruwukevogojebak.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/64875014325.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/33720152402.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/bozifox.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d2fc08cd---26821086252.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_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 10248 bytes
SHA-256: c55c490468f05b79672803f84304d4b564789c34a17e231191af48ff49b232fd
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17416 bytes
SHA-256: 3d33184ff7b9be0f4591021f783d88b2bd613fe5380aa999bdbe29d430b5cd99
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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