Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00e944caeb109a7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 09:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a0d48dbaf2374b95f57ddf77779e020 SHA-1: fae5028713abe7a033bee186265974db8833d779 SHA-256: a00e944caeb109a7efbc3117c3971653c97018022d6ab0d9491a8a31ad1b72f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://karthikeyanjayaram.com/userfiles/file/bosojaxa.pdf In PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/48179276618.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/nojigub.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/14664588441.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14907453188.pdfIn PDF document text
    • https://airbays.com/userfiles/file/80094107005.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/1071029113.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/86643735973.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/14403832977.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tinomefovinologezojiz.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wufibiw.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///fulugodenaxigozejaxogoxas.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xumetoduranekegagek.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/1022998741.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a245c1af501---sorexijiwukazoxanirilor.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947fd809a90---43390919247.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/tixinu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607375f504bd1---pojuloveniz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/25716471717.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/37356695122.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zuzamigudadilexegave.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fabf5c00de0f0f442109e1f76d67cf19/37618395035.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pexatofiduxifemeluwigivi.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906051619514.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9402d7a3ea7e5e6f0bb1592dea4da13a/zesafonikomulifekivutizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kelekatan+orang+tua+dan+anak+pdfPDF link annotation
    • https://doi.org/10.21009/JKKP.012.03In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 17532 bytes
SHA-256: 4c0c1eec98f8884cac3784afa6d5e1913a856244b6b9aa3567dc8dd31b4b5c64
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10596 bytes
SHA-256: b7ec8e221fbd242680d07f2dab850e1310ebd3148858f0a9bf1eac897bd790f0

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