Malicious PDF — malware analysis report

Static analysis result for SHA-256 13411e4ec0168c7b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1170e0d072d8828bd5a0d8fe97bb78c8 SHA-1: fa2447366ad0db025f963371cb9e468bb833403c SHA-256: 13411e4ec0168c7b0d77e7a7d9db47c39ca2837fa14698b1c09b30dc09a2491f
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick users into installing malicious browser extensions or updates, a common tactic for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://canoeing.by/pics/files/dijikekisovafezapojibimuv.pdf In PDF document text
    • http://moveworldtogether.com/datas/files/62716245232.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7ea1f0a6ff58c2d6d7121a3d4020ede1/dukijemuzop.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21060610461704551908zps.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/fosekoduwu.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/11390894454.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pf2c5r224bvtph0v5c312ins6f/93646642911.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/16717253473.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/nozifumuzizinalep.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c6ea102812388d88d82cfe47aff1242a/33397499545.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/40117968647.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/zejonere.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a17ac195d---dolematopovufipulatamuba.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/lixonokajijivipi.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/84974871744.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e8ebef39---6066873574.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/97199690570.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/wiruxodidakukudemazi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/gazadisusivibufupujap.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094427dd9d60---79813965632.pdfIn PDF document text
    • https://stopserv.ru/files/file/87403413153.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c55be16e289c5a274aba1607ec7b7294/dewamumoviwet.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/9993395869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pmi+agile+certified+practitioner+excel+with+ease+pdf+free+downloadPDF 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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 18092 bytes
SHA-256: 2230835a287e8119d2ac9bedbcc816c96313dd7b6d853363d06ce3543994e014
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11256 bytes
SHA-256: de904d56f0c3d66f21475e4262de56298d14da7ec5360e560ec406b05efb1133

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