Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a77873d4b929edf…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 15:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 173ffe38d7cba0a58c8600d0a265baf5 SHA-1: 0f920baded9e734b83326c4d76cb92be640809b6 SHA-256: 6a77873d4b929edfe6817194013d59a86da701954fd1c744ffe28eb8de4fcf2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=monet+live+experience PDF link annotation
    • http://rsst77.ru/upload/files/suxatixaz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rafojowirige.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/92eb6b0c85c7e131e35ebf6f8e5661fd/gapezulodupaliso.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ecf59d972f3f1cce8c7d2fc24b2df71d/80225581723.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160792ad896442---xazedoluv.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/50sg2hfmnvetmv9ono5rlo27ak/89517248644.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/f73790df408a6525234a992aec830935/kedudinezamigogakekipufev.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/dosubinoluk.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/keu2doa3ebusklpq3j6asvvdj3/38019192773.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7didveoc6q9febduntd6is6601/lodugizezijakas.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58002940860.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/44024602708.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/298807de38672eaff6a748bdd993dff6/gonelafi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4853de46f---bebawoxerasov.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/33156125565.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ce5dab37fd59911466798aedaccf53d5/98773993979.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/firorudegijagarekuj.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/6783629921.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad02f3c7e---59472806806.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/26077caf5d0679169b9f9c29e52d7204/megurokurobijak.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tabatuwujokubabesawi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7725fce900dba9162a629a939cee25b0/53653369798.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/82663687879.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0265d649b---27178254772.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16580 bytes
SHA-256: cee7d97f1a8581bf2cf1048fbf64d51a7012701b1e1dda1ea248f16deab29e9a
font_01_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 10200 bytes
SHA-256: 2b8a6996ec005c6583925a60e13e10b784789a5d43f170c0cd85821e25bc8477
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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