Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fafefff2a7ff6e…

MALICIOUS

PDF

85.1 KB Created: 2021-06-11 02:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d5ebbced00e7fa86f0fe91ec31b64143 SHA-1: ceffa106ceef8806a72cbf5fdfd4b65d823e68a3 SHA-256: 79fafefff2a7ff6e06cac2be558e924f2268961617c5d1388725f2782838b668
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits malicious characteristics, including a high ML classification score and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDFs, and one directly linked to a URL with a 'cracked' software term. The presence of a 'download button' heuristic further suggests a lure to download potentially malicious content. While no scripts were extracted, the overall structure and linked resources indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=ufo+vpn+pc+cracked PDF link annotation
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/r14i6r63ht6b3ki1841scla44u/pukobapibasirof.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/xuwetob.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210601104126.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c69cda12---70298164731.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/7a4jp5ogqai4rkkvg6c5jd9oq3/popirodinag.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9626e96e178382b4760bad7ad584a62b/45083627888.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff9af7b9d1---pesapaperiwawoxupum.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9c6ace57---46359665188.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l303tmfcshmbfnu0735i9o2017/tajime.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/morodejiza.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc208da8776---9485790330.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37dc88c60---89691550129.pdfIn PDF document text
    • https://asi-filter.pl/files/file/3325993206.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ncu4qgjel358bd3n5sj7pe8k2k/fabamoguz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 5056 bytes
SHA-256: d8c2770066e894d7672f18047095db5b3537864d93119e950ae568f6d8de6ae4
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 5112 bytes
SHA-256: 835ccc0a8b46849254700d10eb8802a4c43ca1daab6f011f14926ad4f97288ad
font_02_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 12932 bytes
SHA-256: 1c435d0b9e7758f7c5cc11f9f7d17afc472610185176b2ada45e6391e8e5d950
font_03_sfnt_off00013092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f

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