Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88dca79065d5442…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 23:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea22275d9ce966b9bcf7387e15d0c88f SHA-1: 5e30517edc8252561e2927975fc6f0d60663178d SHA-256: f88dca79065d5442cf95a0e55769346590ad537abc799e05e58312abfca0aa9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic, combined with numerous links to compromised CMS upload storage and disposable hosting, suggests a phishing or social engineering attack aimed at tricking users into downloading a malicious file. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://szakkepzosiklos.hu/upload/file/totepegiritagezumovopojej.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a48d5ad7d1777ab8b90e61ac46b610df/94759188014.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/74020136621.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/aa47617995205edbf0ea0b658a920922/biviwukabatog.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160929018008fe---17226159555.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15286858514.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/71850475326.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/devimafofu.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/nuzozifopana.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/guzokodoz.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/65200468385.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/kirokijaj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160900f5bbef7e---nurivaxotibabizub.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/48213488143.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/83249423731.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/fejerowipofigozeluxi.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/90463516111.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/22412612887.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/kiziveli.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/88784313730.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/gokodewo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/50464410630.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b50a7dcf2---zurafefo.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/vapulozuruzet.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/losixe.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/7300251057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worksheet+on+properties+of+triangles+class+7PDF 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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10892 bytes
SHA-256: 57c637aaa882772e18034af0aa9f756d786912ddf38d9d5878bdde7e29314008
font_02_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 17732 bytes
SHA-256: 2e367484ab5e214c591d473e2009cac1ba6dde43917075b8d883f470f4c415e0

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