Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b04fce9362ba74…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 12:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4948a42d2d4af677908390c00e41f850 SHA-1: 3c65e79b978cb994e9197df6aab93d6267d81d63 SHA-256: 84b04fce9362ba74e5a13429a0ed8e67bc69f7da1587f835d8b9cb10031b4b7a
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for gaining unauthorized access or facilitating further compromise. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://yukkumpulgroup2.com/contents//files/wijipuvomuxalizokub.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/gonemaza.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/90434887126.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c049e207af---33865443291.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0bc2e9b332b555f4562a4e018d9c0a7d/27726487709.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/bipijonuvikexifewezopow.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/150817024e1ba2f17edd4c5176e42596/27792084466.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/46911932671.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3658f7c06b---93440632639.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/libulosi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/bd622c8d9d13c7bf144462de2f5cfc73/karumawewuteledemepofo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/96781011425.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c823e3bcdc---39524602313.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/34466361077.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161269114e3fac---zumubitiwogumemiki.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/58291249897.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/63ab07eeedb78d5bf4c31e08881b14e5/51025553311.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4d6bda44---nizezuvawi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/82046288531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=oxford+advanced+learner+dictionary+10th+edition+free+download+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/47409043310.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_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 17856 bytes
SHA-256: 64a5b0d03256169087cfe8c56eacf8dc9c6e3a84d98709afd0ef765dd773decf
font_01_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 11116 bytes
SHA-256: 84c1184745f8534ae178a269cebe9e39ff3c58cb60aeab19605bcd84a7607e5a
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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