Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a478d53f3776b0a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 00:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d349ae2bd5cf5d07eb6b570eccd20aa7 SHA-1: 98fee33695cbe512c427511500e88685f92c2fdb SHA-256: 3a478d53f3776b0a2c9bcf15ee16922fb896c248374310266b7d93e8f6022772
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number for issues related to billing, refunds, or security. While no scripts were directly extracted, the presence of numerous external URIs, some hosted on compromised CMS platforms, suggests the document may be part of a larger phishing campaign designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://garglob.ru/uplcv?utm_term=android+tv+app+update PDF link annotation
    • https://ou-ravda.com/ckfinder/userfiles/files/fiwunizu.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/borejibeleromuxizevesevow.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/64051074091.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51e36938e---vojonizowewuv.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/98662616821.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/pivodidolosunit.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/86319104389.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210911_FCBEAA7DB4051F5F.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210909232639.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/88308805501.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/faxes.pdfIn PDF document text
    • https://phukienbep.net/media/files/pipisinepej.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vegasefupumisuwe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/povofefasikok.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210923050605.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/muoh7vbp6a912vqnr8d53grv03/28668168397.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/rijidugujalarom.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/9321052700.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4654b7b8325dcf21827dc39cccbfb18a/97651554681.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109061554232589.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/viduwowafutabagat.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/24419233479.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/56143834036.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902043143869875.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/feripariguvetodegezev.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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 10320 bytes
SHA-256: 9cdba0b976dd46b720d08bab600998988e9056b43a54e479daa03bb1bd383e82
font_01_sfnt_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16308 bytes
SHA-256: 2c5aefdfb180e5d2bd27aa85c2ebc93ac903a7f6feb063f31216799433c70898

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