Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aafbac63c4358e2…

MALICIOUS

PDF

71.4 KB Created: 2021-06-26 13:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 56f86c58b763da0a6b25339eee5764ce SHA-1: 400551d6724815151e7c99242a1cf8b800d5cda5 SHA-256: 8aafbac63c4358e229a0af53d9f6d4fa9f79458432616a3c2306db002dbedec9
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vishalahospitality.com/ckfinder/userfiles/files/zasogideli.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d3e546ae9---57583391041.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afed6afc71---22326792988.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f5afb647c2fd8abfb64aec5d75db855/74973558953.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c2ceeb10f8ba41ad841abcb7de53f496/paxub.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2g7icsl0re8uepqspbkuj5fke7/gugiz.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/44077157423.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jewugosolekafuweputu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wojemax.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/grnfh7dp9gkilml3gddjd75g09/29644610241.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jopuduwusofozedusob.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/5ed641593cde6e09137ac7ec74935480/86227638513.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/xedivegubawob.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a643037b21---xivovotulafazedutituzo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f12392d48456beb5a9a69ea997822b01/towokitosiromozuj.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0g5fvk9mnp476cr8jf1epful6q/rijowixotoxi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/50615f28c575801f6a9687df9d5c6280/21355464096.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/3k5gf3gi4i9htjat7huibnt2o2/61566643450.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/mokakomejavixukomi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///93975735264.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c402634cd---25531158758.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gm14jj7p3tk8doohrjr047r16q/kixarenavagutipimidega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+to+say+at+interview+about+weaknessesPDF 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_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 10752 bytes
SHA-256: cb776d89946ff167b1037261726b3f5a409bef6e58dc9c69b3266ac3c21f5ad6
font_01_sfnt_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 15640 bytes
SHA-256: 2c375f5fba82f921415a46b1bac228e89a39e03dda40a4a42dea73ca016cf1b5

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