Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0c4f8e14086f76…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 00:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9b31afda5dfa10a3f221853cd7897165 SHA-1: 92b88174f6ee254496f27c520d475911fc5b09da SHA-256: 8a0c4f8e14086f76914ca95655394e2d5515cd947c59552bba323162ca705836
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://crysiq.ru/uplcv?utm_term=special+education+for+all+teachers+7th+edition+pdf+free PDF link annotation
    • https://yellowmangocafe.com/userfiles/file/tanadoraxidimeguwimaf.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/32346643372.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/wopebusedigigesesopivage.pdfIn PDF document text
    • http://fkhd.cz/data/img/rojugusokozija.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbcbe5152---63843126101.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/899c051284ef4b424487d7e413554be8/50563242681.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/76977537017.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/92179787983.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2db2ec9f808255d2c5200c88e9a92268/36429186568.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/54969019522.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/roxedofaxofibepuz.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/16901175623.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/44777372991.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/5608108125.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/96539497090.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/34718897397.pdfIn PDF document text
    • https://majubesar.org/contents/files/bamadepomukapoxewerota.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/80267308322.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/13617689470.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/49004994832.pdfIn PDF document text
    • http://hkacca.com/userfiles/45936034898.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/fojuxuseki.pdfIn PDF document text
    • https://cartolmania.it/file/lezeg.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/kajokukorakusuxowub.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/90339800170.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/91244133472.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/53399833458.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_off0000b569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 15140 bytes
SHA-256: c9702157ab31c15d0ac930fa10dc8854fff350be45f0aa5f348f118aad8ff89c
font_01_sfnt_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 10940 bytes
SHA-256: 216ca2d2b8d37c4663c4ae23c3e0bc896571fe880897abffbb3e54cfc47fb4b8
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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