Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f9783500ff4040…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 21:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d39eb9c1aedc3f1c63ba4acaac2abee SHA-1: 55f3ec08254f0c7b51c0f597e3cf2331c09ce248 SHA-256: 35f9783500ff40401092ee7eabc61b9a2e73d8b4183219960046353055848a37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which appear to be part of a link farm designed for SEO manipulation. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=recover+deleted+messenger+messages+android PDF link annotation
    • http://omni-links.com/images/blog/file/nutapifewagizaruvupe.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/xijobafebavagozi.pdfIn PDF document text
    • http://darstin.com/userfiles/files/83600001209.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/fugiveweluro.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/88661757931.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/rivakifobanew.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/xisagerumopefodaruzu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/28500684560.pdfIn PDF document text
    • http://millecolori.it/images/file/18033847273.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/71519745015.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/44922897890.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/23839512802.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/10861388589.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/55682624325.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/nomeguzofiselijatatelu.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/10682864907.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d46c2bcfe---nopisulirewinewoxosutowe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131703a80e84---gopelos.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/98453804644.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ae103ff2---dusosezi.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/78113812263.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/jixoti.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/vukitimovuva.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/lugezimixepi.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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10824 bytes
SHA-256: b8902dd18d4a7bbca074392030d3a6814cd6f983506107960cb6637f70d6baa7
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18552 bytes
SHA-256: 23a1417800d8e889b675f14718cfd8aec577fcf16f6c9c32c9a9be02f2bd1047
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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