Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4e86f00f8d01b6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 17:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a577651c739c57756e6032127a71344c SHA-1: 12d4162ad05ba7143c77183bbf04c4b3f216ca02 SHA-256: 4a4e86f00f8d01b60e5f5dcc14deddf3d472fde3f564531345943cc04637657e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites. The presence of multiple links to WordPress upload storage and disposable hosting further supports its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=bank+financial+management+mcq+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a56f12d13---89773264633.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64439dffa---resalubu.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/menuvoresuwijatuk.pdfIn PDF document text
    • https://baongochoa.com/upload/file/29349634069.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce6f0cf108b7263e559e298c9e43f936/polejugano.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/belakuwe.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/7678569043.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210510064425.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///jeroxumagoza.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/26140735436.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nezakaniweduxibukirif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7705917a6---34515610535.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/tagegunoriwufumogir.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/74063609398.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/56252944425.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043fbcf0a3f---59359743014.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9444a9a2bf5ef1bb624590082c14433b/1197297157.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090141983f97---31701659462.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd1a8392a0---wogobupuxopujijupoxiwimu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/54909982452.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k47nvnh91adecqgbfhdv6h4h0p/tugudovasilenugizizupofa.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/tetesetulanorini.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/mixibeviriviwixivam.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_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16572 bytes
SHA-256: d363f960353b9e8a094fd5e5070185cff6a7744c00118efb46d6614a0aa02b4b
font_02_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 10864 bytes
SHA-256: a96b874cefeef093a49d1ac604c2674095626c3139f3f7925bd76af06f5f0885

Open this report in the interactive analyzer, or submit your own file for analysis.