Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cec6b85ddac5756…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 13:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 808c82f20367e153e8473c3ea6bfdb06 SHA-1: d95d95e1aa9d16e16c81c9e949cd6554eb5cb027 SHA-256: 5cec6b85ddac57560f3766bde4c9ad88cf0aeb79ba2e6c02f066d5b95cc25f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall detection indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://cructi.ru/uplcv?utm_term=gagal+ginjal+kronik+pdf PDF link annotation
    • http://www.egavilanes.com/ckfinder/userfiles/files/lexafuxifekubizusaxi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1723130069e799d04e7186ad95f792c1/lelobizum.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/nigovidebenoto.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163097033869.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/damal.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///33433712058.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/mupezoraz.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/60429153367.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/56984979377.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/9595014164.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vogolepam.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d4954bd9---91659761354.pdfIn PDF document text
    • http://nscenter.cn/upload/files/dokipenodowazipu.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/54855523966.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e710ef778a5fb791ceacc9cb68dc748d/pupuvafapibi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/45328586195.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/89060450215.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/melemane.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/56678332613.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///taromax.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_B9B7143C613F0F0E.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/kuzimebebemasejafipodenij.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/85729615253.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131464c80968---61562747981.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/2943477456.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/watugakinufamekulivavuf.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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10536 bytes
SHA-256: 787ac8a3a61ab1b10ec0b5257d432d2b77408d7b0c458f4ed9aa06965d6f8d59
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 17980 bytes
SHA-256: ccf4e70fb18cef59045fac29164985f4adc65118487fec9e67370881cdae99e9

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