Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5de7360529a0bb…

MALICIOUS

PDF

83.9 KB Created: 2021-07-18 22:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c69237ea6b5766b19f35b81bf29b5109 SHA-1: bb6c6df0a8705cd73464d8ccf1c9c0b629c241a2 SHA-256: 5a5de7360529a0bb10d8399590b40b646147fd55ee3ea755d4153c5e665c2e4f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to click these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://grupahatak.pl/admin/_fck_files/file/62363296048.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b035bbf84175e225a3d1df8a4de3ae93/95957236036.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/61243818292.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/89e71df22cadc51bf83bf06e0f3fb9fe/49183556230.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621804451.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/62743708560.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2513eb4246485719a98fe621aa8f562d/razazukozaxebimiwe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c00e54fd7---pafejawojaziwizim.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/94170310828.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/76286cd64a5603e662c0700d2c04c3de/kulazefiwodibuduzez.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/90i4o4rdbpi4bivfn1hlk0g9ve/ziminisenese.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/vejuwemolazutizotan.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af45e098a4---lijanasomazagaza.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ea5dab40---gofusupojowipox.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/senapiko.pdfIn PDF document text
    • http://abnicum.com/files/file/86210229617.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503053353.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2dd05a74---83205367559.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ce76194212aa7e4caeb04b259b525074/37863348383.pdfIn PDF document text
    • http://bscartridge.com/pic/40480139097.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7730203f---dokusuwuruxagif.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/88590135248.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/3706613645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=filter+array+of+objects+javascriptPDF link annotation
    • 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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10796 bytes
SHA-256: 3d26badca726d3d3325a6e1ca107a5790d41ddfdb9dd99f8858f7f07efff47b9
font_02_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 17400 bytes
SHA-256: 35bc64cd3628134177e8a7d7de57332a2636c45de1bc6c37d1ed14fb5bc753f8

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