Malicious PDF — malware analysis report

Static analysis result for SHA-256 472402f89ba0f7ca…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 14:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49c95a5d7dd83087a2a202b429eb9d15 SHA-1: 7081eddada2ff8a1bb3de12195c63eaabef0fe96 SHA-256: 472402f89ba0f7ca5f4b994e8e2bc29e7eda83de3d65fc7f4b61b45a475ad278
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to malicious websites. The embedded JavaScript stream further supports malicious intent, likely for exploitation or further payload delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=prensa+manual+para+tijolo+ecologico+pre%C3%A7o PDF link annotation
    • http://ainut.fi/userfiles/file/zuvoj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ce1d0de8---68299116111.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/3e4b9099e6a9d3894b49c5adf3ec73a5/xodisabikuwer.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/59079648832.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jalize.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a5ea38c89ed19ec7f30a8b72ad26327/68875137490.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f90c2730e---jabivisuxetogewe.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924a509d99---88490715741.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/03302aa21e9bfabee5bf2b745a67d810/sorifowubasujeb.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3cabe106---10013176602.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/sanotaxuzudoxu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/72377778176.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/tivositunasexog.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f813705c---dudogagunopexavapepane.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074a380174b6---6226767179.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/74418914177.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/buganevazutol.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/78900581706.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8c8966e6---xixoromatifo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qu99vgnrt735ml9jtie1hrif83/linulalaluroluxedunoje.pdfIn PDF document text
    • http://fohow77.ru/upload/file/zujobome.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/fudanewanus.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/katojelazi.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/78476703425.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/831831617.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 20428 bytes
SHA-256: f29283008f0f57559925c3911548ddf9651bcf2c0eb79d41b722bf32d896c5e5
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 11144 bytes
SHA-256: b53045a594d0345cddbd30ff2af2632903596930cfe69bd5678bf663b250b6cb

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