Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a397e5c884fc22…

MALICIOUS

PDF

89.1 KB Created: 2021-07-25 05:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8484c5517111692f2d5d2648f2148845 SHA-1: 5b8b141555d91681c2a47c60a3935b992a3ca3ac SHA-256: 41a397e5c884fc2232674272296cf86b9ea361da5ed0b64837ecbaebf9591133
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into believing they need a password to open an archive, which is a common tactic for delivering malware. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, further support the phishing and malware distribution vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdf In PDF document text
    • https://clap-bas.com/userfiles/file/pejamomerasafox.pdfIn PDF document text
    • http://dsagco.com/Upload/file/54456792672.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210628191912.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3e3688db7e0c9eae1ab8ed87381ee004/11084285262.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/sekoxur.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0fed832ea3de02f560272031d7e241a3/nuxipebu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/xowekagigadot.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0837a1e651---banipatinulilom.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cfe4a7d36b0158c28f14de803cb2444c/70256000808.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/jivujemilobatekukif.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/90134087333.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0be740038---kuwipanuwusevametiw.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8ac50ddebcb4e0cd7d8353e5df17576d/70739442596.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c153da663---dazituxorab.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609628f94fae6---66940797207.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6de3d2d60---sinutuxuxuginoveresi.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/28570458369.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210702003724.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ippgi267cs2bk5d8ohi9ae3b2a/josowogemosovegafipu.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lisaxiguzupogur.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/rediji.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/saregukapamakeg.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bubit.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ea22929e0---13717655388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=photo+to+video+maker+software+free+download+for+windows+7+32+bitPDF 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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 11344 bytes
SHA-256: e4c88f5e2d01ca3f97c4db4c712793cc532faa969186f48a0b3449780ed7980d
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16860 bytes
SHA-256: 39a49d5418bc395061dfeb44089ec4ef837fad9a36eb2debf50f584f4a4a2e63

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