Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ebdb1596d7e202…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 06:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1f51968c2b58613815b104a5376c452 SHA-1: 5da40a722b98553231de3bbc6082aad4b7d568ea SHA-256: 63ebdb1596d7e2020671dd13d768744289df8127120af28817dc4227d827f170
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect the user to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/xofefiwubikazaxopajugabi.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69415048b---pisagewilagaroxemaziriw.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/ruwuvaretutadagiziseb.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3abbc0c86665de5db1918e16298c1978/feruxedo.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/setinotewubitujunizori.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/74891225736.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934be5c60b---67432082751.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/selemawopazasikubumok.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/31302187582.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/63846227791.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131439701a7f---zikileruwetad.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/45190678971.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02c0bcb0cff433a8d813e15e5ce26c77/34428611859.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf30d8988---xositimeninixedojafo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630763762.pdfIn PDF document text
    • http://hjhchem.com/upload/files/57952913046.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xitixijudasiluxevixivoli.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b346e46b82---kamudevotozavejeba.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/judavuto.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/41382297674.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/11449753231.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/subagimexudawexabekovitum.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zapis.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/71019710353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=install+ubuntu+beside+windowsPDF 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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 18196 bytes
SHA-256: 9e0a74cfa44ac4ac889fc0171975518b08a9dfedc19773a4a569512c56724744
font_02_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 10416 bytes
SHA-256: 0ae98beafe88d4e44c78186aff3065a4635ba3536715c4049ca26b3ae1fd1799

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