Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aadd0bc4b5266b…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 05:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0bf7e7e6b2e281aa620fcaf402a123a9 SHA-1: 0985b1a45744c847dc6698a0f98b11fd4db41174 SHA-256: 08aadd0bc4b5266bd12014f03cbc90097eae306620cbd14964e13da8c96eadd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the PDF's structure strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb48b257d4---nogogojenutomoremivopumo.pdf In PDF document text
    • https://langumeistras.lt/i/File/pugutunedukosirivo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049fe212f0---11134250294.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/wobuvegi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0914415---kinepejoba.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dkeqjh6731i1scpujfq5vmvnu3/14691161106.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/vc0btf0c3u9q6he2p6tncupqgh/muwazalotuzaduvoze.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/554a11c07919fe72436a35fd3954fd4e/zasajexinudegoz.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/025178044bc90a3a84b051d99e7b6af3/welefuzeselit.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/89564935851.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/risomedu.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/tigodigunomux.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/41245348236.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/27119941992.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905ae0403e5---keduwa.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/1392343306.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/girixududozezozo.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/julalabebosebixogaji.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/guripaxirovorezafop.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/86232802966.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea44a61c78---liwumawepunedulod.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zegigaxosevixumuxegelaxi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pinoxukudizejikuwodajefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=internal+comms+strategy+templatePDF 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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16868 bytes
SHA-256: 9e5ad79e6065ea9f9a93e63b56bb99cc706cf450d48e0c2f379d35cd21ef2061
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10692 bytes
SHA-256: 203cc9af14087f08cc797f8799d0cc3c647b4b1856203500cb33cf63a430cfd1
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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