Malicious PDF — malware analysis report

Static analysis result for SHA-256 906f1689c79be265…

MALICIOUS

PDF

87.4 KB Created: 2021-10-05 16:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b20358c3171c3248db51bafc48b7d67 SHA-1: 32dc4a028133a4e9a164e254fd0df1c253cd5347 SHA-256: 906f1689c79be265a855bacc228707804426a9dd98795ad6d8c94352284ae3c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=when+is+dill+ready+to+pick PDF link annotation
    • http://chinalabware.net/d/files/7482424162.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/wonikulaza.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/5569896649.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/61078086540.pdfIn PDF document text
    • http://biomehl.com/images/content/files/xuwekajulikixinozob.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///nefokazojonojipejofonuzi.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/zalaxosufedoluli.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03bd33c69---depogexezew.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/zonesuxajiw.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bab098ecd---bezevudi.pdfIn PDF document text
    • http://www.bash.cl/media/file/gewujamupotimofazixaxu.pdfIn PDF document text
    • http://swhos.com/upload/files/zozosiradiluriwaj.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/23001924887.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021922338352820.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xejafesexemapetezidi.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/wiguw.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/tawosipibifus.pdfIn PDF document text
    • https://seikai.jp/free_images/files/76349644185.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3976e878.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vozezolosudesukekov.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/17497448516.pdfIn PDF document text
    • http://mimpiindah1.com/contents/files/52574126638.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210912002440_639260.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/galovekoromufopatem.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10812 bytes
SHA-256: 2d95d7ff846f06aa5021b001bdaf709c8996902416a5fb1ac4d6a12fdbe22855
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 18492 bytes
SHA-256: 0e621b201570cfa7f295c1cbda7511229ef5a70e231bec0133293c57a95b799b