Malicious PDF — malware analysis report

Static analysis result for SHA-256 db93273a510f5153…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 14:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da593bdfa02462f8d94849f2203fa8b4 SHA-1: 85d5ddaf2dd50ce9932365835cce8ecbea1bc154 SHA-256: db93273a510f51532c5dd6bd1c415cb215a00f488c0fb3c42e9f649f5adccb43
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://vegman-kzn.com/ckfinder/userfiles/files/8942287454.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/mugewugepujixekuvoto.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ceb6641e2---40227063096.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/11655956919.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a238806063---tufasilupiruzuxavudixe.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/36533356706.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146570318b98---44853181920.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d0e9009285324f3d85b316db0c23a804/28505083556.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4192d536bba657416d97807960846538/28513745124.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/50315960455.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/vetafarevukupikakak.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jotewaratuj.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pinogomugelalebum.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/nuwibajoxitozi.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/lajesurotapugumod.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/4083302100.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/32989359817.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/45180032174.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/31068989743.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/72641129721.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/72710135738.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_120315.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/rewagawogitolezoxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=warcraft+download+androidPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 17660 bytes
SHA-256: ccb05f2bac529a48f1c302961de20612804cb1ffd1634dafabeed0bce4eef281
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 10248 bytes
SHA-256: 202979b56fe52d3ab90c56940641d929133442c99b5e083041129acc595e4eda
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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