Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d65b87c0639f781…

MALICIOUS

PDF

77.1 KB Created: 2021-08-17 01:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 089ce1586b1121980f0f5bde70baf8e2 SHA-1: e02487946779915417bf178564a4a303568e7e4a SHA-256: 9d65b87c0639f7812c2182d86a854cded192b940545ac4fe8d31fbe0da879378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+do+i+program+my+overhead+garage+door+remote PDF link annotation
    • http://harasim.cz/uploaded/files/83382542524.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/17988445960.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/gobinenijemuta.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/30256358906.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/janezodawajesalukiw.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/89641500359.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609084115c160---jowomibipewurutivedikam.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mazuxivefemotesijawazux.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/19569989841.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zeguduw.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/91385783403.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/34159685225.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4db014115bd22d8440ee9307a7684453/34289166615.pdfIn PDF document text
    • https://rosycaffe.com/file/10414208424.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ee4d3887d---ponexofumevufexawoz.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/48008800895.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/47153689311.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/2533340219.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/47196034096.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fopesidev.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/30e5b08cafb2c39d81c0855701ce9836/45165460616.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9069c29e7---gukojeduwuwoxitozaruget.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/10624318282.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_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 16236 bytes
SHA-256: 975c115315497688f163fcbef88891272e333fe6f5c0cb5ed7d4d4080c6decda
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10776 bytes
SHA-256: 747dc489be426eee988f5b66d7392a7edc61587d5eccfb02dd170ee1cddb5571
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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