Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea7589ca8ef88de…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 02:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf5c03c5550890c4c8e7dd05e931f917 SHA-1: 470371f7904c302f1b7d6f453ccad208bfd4c1ea SHA-256: cea7589ca8ef88ded10b599625ef4d2ba8e6dbdd2def774486f1be2f2a1c5ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a link farm designed to lead users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/53011799618.pdf In PDF document text
    • http://solee56.com/ckfinder/userfiles/files/16074583053.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tuvijevovawebuwulezik.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xogizisuti.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/73987079824.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/bakogisera.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/36149721742.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/84658980881.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90844cf68---wijudufakonobodosa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6024524b2---nazisaluzi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af774b1e9c948cfc8900a23886ea3519/lutenokatapelowuvaju.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/lazuvedexafisud.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/jomul.pdfIn PDF document text
    • http://firegallery.ru/img/upload/lijenovami.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xolipovawizazopudakav.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/17150615875.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/zoganedekenolazi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pozoxutidegutog.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fc0b3584786d3853927eba0092433b12/fowekekigevagilowexoxab.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/jevikedidifar.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rirup.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e3145fdc---43774972306.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/60964777205.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/lobenopadupixupa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89dec037d---58243624840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=upright+go+2+user+manualPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8837834988.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 17888 bytes
SHA-256: 8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 10928 bytes
SHA-256: ef47ec360e5d1d91222b6d8d5f92ae2ddb2639316c1335c6851d885b0128b1b2

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