Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c29e4f6e09364ce…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 04:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3d0a1051b366fdeca5a6b73fc335099 SHA-1: 44786f11ddae7a553b87380a9a803df234baaf2e SHA-256: 0c29e4f6e09364ce2b5ec5ad17a8c3a8abb732d2e78560d2a2bc8fd2b59dafc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the document is structured as a link farm to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=pokemon+ruby+nds+download PDF link annotation
    • https://adepotcustom.com/UploadFiles/file/20210910162932196.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lc8ffmjapbrjtiiuhegqbce0pg/9204593418.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210903_58F32AF5D8F58CA4.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/98784880933.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fadutubotaxux.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/terefer.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/mawakewuje.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fogodananumozer.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/kijikatobiwo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/vajapuz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4ed379818d2f98b01a0ebed335748843/14504963233.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109162322093998.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l3mkfgonq17fpsukrlnpnkfbpd/85256644688.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vepewomigekonijikapu.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/82829533555.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/wopowasigelotomo.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/85079741345.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///2325741332.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/62966468120.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/somafezuxomifebazutisem.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/xojunita.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d7b814448ad559222026dc60d50cd9ee/sirovuxaxigonujibobokur.pdfIn PDF document text
    • https://argumentua.com/i/file/kijidodude.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/zenesiwuxowezoxojik.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17804 bytes
SHA-256: f73e030ce0656cf1100a1ab2128a61ac2be9f1ed90826d6e3aec41dda8524d6a
font_01_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 10752 bytes
SHA-256: beedb28da573b1ea1a94e45e1fdbccc3bf899b7c603079ca655034953d81088c
font_02_sfnt_off00012f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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