Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618ea1a051793a5…

MALICIOUS

PDF

101.8 KB Created: 2021-09-04 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c43252abf73484594120b1bc8bcb056f SHA-1: 5144cf957c2d42bb850ca4cd887f8851d4dd06be SHA-256: 3618ea1a051793a58b593676f28382d034e2c14bd12889631550feecf5c7b173
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or trick users into visiting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://autohondl.cz/userfiles/file/jusekinirena.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m0dt5db7nu37ck5v37gqlaj02p/likazividuvobazi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/41183172641.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d4abb180da359cd73819e94ddeaf96d/61995710841.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zesavedetiwasi.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5568767da---wubibirumokejarem.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5580b9d6f4c721ecc1f4d459b8cd0bdf/xefazalojogavekerunumin.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/zerawemideje.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/26878058600.pdfIn PDF document text
    • https://digiconelectronics.com/media/juvox.pdfIn PDF document text
    • http://orem.mn/uploads/files/lobirubowumasa.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/pinamara.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/97559667345.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/43879952098.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/al138hc8lbmqsbtvrb6jhmmc27/pegajameb.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/timadi.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/77274338005.pdfIn PDF document text
    • http://lg-palette.com/upload/files/94791621359.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daziwepukowilomev.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/81051913496.pdfIn PDF document text
    • http://xsteelstock.com/d/files/77180316251.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4de13699---lotamawamenezudutaxase.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/98b0203dae0baf7d1bec1a62ea80fcda/41943281073.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61751135a9---43344975319.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lokinegemet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=opinion+paragraph+topics+pdfPDF 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_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 17144 bytes
SHA-256: 9d0b209ef89b2a5e9c6ec7eb4ee4ae7d16a1622ac3574f584419577653d97202
font_01_sfnt_off000158d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D0 10748 bytes
SHA-256: c0aab77c3775bff132de8a3be72b92084eaab4edc78a5c554b42321d9abcb814
font_02_sfnt_off00017147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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