Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7d4f393802a46b…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 05:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4aee1f7c018f90e8ade2936dd8b8688b SHA-1: a3a36c96568307035d87f21069b1449fb0cb11b3 SHA-256: 8a7d4f393802a46b7ba1d4f5c8bd6543933713bf8cb38c6a63f7be1737cc33c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, which host other PDF files. The presence of external URI heuristics and link farm indicators suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=driving+license+copy+online PDF link annotation
    • https://pjkconstruction.ca/images/file/kuvofowadenijibavixajeki.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/un5ped6rvpunmt0i9lcue8crd1/nogupuxuwezosizukeju.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/67911022314.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b73943a96024eedb5daac1a10084cfa9/bedibo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d58bd74ba---davosadav.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f858de8dc7---gerujuvemusakuga.pdfIn PDF document text
    • http://novichiha.ru/pic/file/76040898850.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/98954380451.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58d6db5538---287569085.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/74125148193.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b31daea7785977c74eb7ce593687583b/gosuf.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0fe3165d---gixigowif.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab40d87d---lujovilubutunopozojaru.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/caak0gn7dnk5oa8oke8mrrldv2/kakerawuvegelovubudafilu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eebd9486b---4864162771.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/106b92dc318c99ef253b014fb03148d4/36934808949.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae415e693---daxak.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f8b31fb1---xowaxubanulofu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073080c577bf---fajina.pdfIn PDF document text
    • https://laser123.com/geektic/files/gaxobizixonavexad.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608766e12328d---64787777618.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b550cb3b---gumazaxoxotulowotomigogi.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/sijat.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/gafexe.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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16700 bytes
SHA-256: 6e7b795c5a30b414526c09320543d1195dc270bfe0c94b0dc687b25b7ac330b0
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 10468 bytes
SHA-256: f64472d0424c8d54d6662077e91fe02e4d56d6ccccad3556a5550e9dae6c6049

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