Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4d1855eecb662f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 21:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 989467b1b486f4be1fcad6cb823d65b8 SHA-1: 4e3ffb459e0496da63a51373321bc1d30f2fdeca SHA-256: 0c4d1855eecb662ffbfd82d297a5344c0fa5c9d10e664353f9ee77393c9ba03e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. The primary goal appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://emeat.ru/var/files/gizasazijefabotax.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8f935a93b---87208711634.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/votogurawovixeduvekux.pdfIn PDF document text
    • http://rilta.net/userfiles/files/2463993445.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b400d130746---65976053913.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/302nv5lp2j7i62kl23st3al52q/9158673345.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc850c45e0d---waperiwupugukeloro.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/pimedizuvimikogiludujola.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/68307884853.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611828c430b3b---lenilanexiviravote.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/rojanezonawutilola.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/1411254461.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/pabuzikivajomikowem.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/46438799383.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a3bd84e0ff8c2ad98a0ec1d85d3b1a7/47113722607.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05d42becd0---kijik.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/xudigiduvibiro.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/33857299085.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/42944018684.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fuzujenafabunanig.pdfIn PDF document text
    • http://wwstationery.com/files/file/bonulaxejoxi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c4830623298f4e5c44facfd2e9c59a76/nazekepodokevasolines.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/91605503189.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qaq1e0a959qhdtjdsbbnac3858/vowuwafenato.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/20039191632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=endocrinology+textbook+pdf+freePDF 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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10896 bytes
SHA-256: ee17a406d3c48747bcf4a67c7f1966dc576fac19d04ad6f1ee580de5efb39b1d
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 17884 bytes
SHA-256: 8adc684d65301e4004cd58e850dabc8c92e2142924eb8e941c30a6a40f42d5dc

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