Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5a2a8a76de3e75…

MALICIOUS

PDF

114.9 KB Created: 2021-07-26 18:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d1ee6d68e1aee891d112404da0f5a1a SHA-1: 8dd326e76a46be5c48d07f4754736b34a6500328 SHA-256: 8b5a2a8a76de3e7543fd5fb411985bd719f663e36b97fd5976ea09f50cc77e07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/52654231913.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/li4q4vqm5s8o9gsiume5m9asfg/nakep.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/36593922161.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29dc39ab4---vobamadenalobedixazapesux.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/bepanuzexuweditez.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cc59ae1d2188dd990b6d3c2130349210/82062543704.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/80220802183.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a5c5587ebca43d2b89fc3d7ad9ae27c0/47840735135.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/27839583135.pdfIn PDF document text
    • https://plasy.com/uploads/file/78051095729.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/potimatuvox.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a803b0a76---kikalinor.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40c397382---18141510886.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a35cce6b58---kotudatebuna.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8b7c986f---divimivirin.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/93738833381.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7d826537f84fb2aa2457db6c809dcad6/26342871066.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wiraxowazobirenujutego.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c705295e---puganan.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f52cb75d3---27525529849.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/1ea89ab5f162417f24aa90d9595ed6be/61883375397.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b98446ff4---25345705834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+unofficial+guide+to+the+12+stepsPDF 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_off00015b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001738c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738C 11036 bytes
SHA-256: 0f8635fe183268522b8c9ac3a41b24ae2130656c84ad778bc08a85888682ba59
font_02_sfnt_off00018d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D0E 18060 bytes
SHA-256: af5c6866a287cc6349874ade3635db6bf815e01915f125b64287d9b154f6cdf4

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