Malicious PDF — malware analysis report

Static analysis result for SHA-256 788cc3e356f37996…

MALICIOUS

PDF

77.1 KB Created: 2021-08-21 08:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1b626b14d5f351c1f7b994d526d4e7c SHA-1: 3c105f21d64adfb2f05dccec2f1d1d148a3179bf SHA-256: 788cc3e356f37996d29ef87c011f5cc164faa9bfdcba736dbfb097ea8ebd7929
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or spam campaign aimed at driving traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=freddy+fazbears+pizza+real+location PDF link annotation
    • https://okud-istra.hr/userfiles/file/dezedafo.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/54694242253.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/logakotu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aed7gt7h0k03ncjn4qp8v15v13/43027701606.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6338be63a4441666100560cdc0fa5a71/81600554816.pdfIn PDF document text
    • https://mauspro.net/upload/files/46193521239.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/47108624822.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/49b227197b9a983d6320f8a11393d729/28039259216.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/22490883474.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840020e284---lanisaweveke.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/88465918195.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5010cac8---xuxomeri.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/k3eh6paivctqg7ppepgibmh1qo/kozizekepemuk.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93308729148.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/50744167405.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c4979134e09a68dd3faba2d81de77b22/46456662046.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/rexugobakimutivuto.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6a89e6ba---porelofokid.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/guwofidisegabuwotuka.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/88723531274.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/30307405336.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/41949595920.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9926727518.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 16292 bytes
SHA-256: 29b269be69a347734db351fc170e42e45283acd993a7839b982cb8f4194c3001
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 10904 bytes
SHA-256: 29d3286977264f9bfd1893cde912313b05c773229e6acd55de096776d37d88ab

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