Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f83c43fca251d4f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 10:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ad70b3b4bf1a66d213f84eb49c1df00 SHA-1: e5855e625310c0ac9125432443a61757ff4f9565 SHA-256: 9f83c43fca251d4f324596816358c68d884be3af8063b8c722bb0d2bd1e7c525
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains multiple links to potentially compromised websites, some of which host PDF files. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of PDF links and the callback lure suggest an attempt to deceive users into fraudulent financial interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.vegagastro.pl/upload/file/kapus.pdf In PDF document text
    • http://a-b-i-s.net/layout/bilder/file/kajebuzupij.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f8d2a0cf85f88260c76a3cdb3b8b0cf/zekiretuzumuwuf.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/61269617482.pdfIn PDF document text
    • https://asi-filter.pl/files/file/tefopuxalodexenila.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/44329219341.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gosasikibezapizonib.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/kimudosabiz.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/82479005625.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c13a2ef253---lopofosatejex.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf0c5d960---mipugol.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/9498665882.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/defosopedomibojubodebaxip.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cb3airoug422d7pr464p44a6l7/fizuroxitipef.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tipegujevadulomakolidi.pdfIn PDF document text
    • https://edgecs.com/documents/43176459480.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/puravanejexodu.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/volivarani.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/25189571411.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161471af8b2aa1---60960355125.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/sisogozigewilejenu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/tisogemegefabuv.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091911174380554.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/febeviwuwekerolumanazoru.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/oem7gfm6cln05p6anb1cvgioq9/42451608818.pdfIn PDF document text
    • http://labonscafe.com/userfiles/givatafasusadikotojo.pdfIn PDF document text
    • http://machulski.com/public/file/88506414846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=extreme+car+driving+3d+mod+apkPDF 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_off0000b922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB922 17348 bytes
SHA-256: 7ecd6e3fd72ddeb1dde07dc67000d173ccf706b77aa43edc5cafd7d592216c0d
font_01_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 11056 bytes
SHA-256: f4f31c31b1407f1d92f311b1ee9d710d8281305a64d22cea90301f7a66d6be43
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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