Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f81f4d2d979f42c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-06 13:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a563560ade1e224ac9d144dccb9a8aa6 SHA-1: 0ca5926bea900c4b52f629e96469657feaf946f5 SHA-256: 3f81f4d2d979f42c74ab5ca64a1d0b736587bc9f80e2f2aa0aa78df0e00ada4f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=does+arby%27s+have+2+for+6 PDF link annotation
    • http://abwlargo.com/uploads/files/31314385309.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2d9a9764884d655d7bc82925e063cfc7/78175084090.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • https://eurocomm-italia.com/file/26005558668.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/4005435116.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210626144457_houp4p.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/446c3cb28b666be987c178884469877a/13422676524.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/90610e77e4ad8d41348e06d1ea0dc436/1348169955.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/11859015007.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/lazusumafege.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/bivenelukibideguxo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f353c134---jomozib.pdfIn PDF document text
    • http://phsbulldogs1966.com/clients/8/87/87911cb64b10f66d93d15f7b6e22d365/File/sidufulezojaz.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7fac1d0---sagebu.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3d87e3dc622944251d2b8a7a4db53c9b/98367187343.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kevarotaxupiwelimadaz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2dcbca38e4201f47fae47c8d3bcf3039/kuboguvagujedagikurif.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/wolaz.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f323da11---24418487292.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e45361a38c---xupikajofemuga.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/18665009113.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_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 17208 bytes
SHA-256: 1a9a2ec8ed791dfc13ab8442669dda09edede1b8ff750123eac062dd6300709c
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 10616 bytes
SHA-256: d38d348130cb8d03b28cc701e47eb2c8c2a5978fba27221dcad8a2583593115b
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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