Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c56c64bfe354e9e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 01:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3afeb202ccdd98a99d100cb272489135 SHA-1: b77d27927276391c0c9b11d9d6a19e8b9c52e436 SHA-256: 0c56c64bfe354e9ebab0836791926d2bbaad44a3c7c0b6c0d642de8e105a4761
156 Risk Score

Malware Insights

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

The PDF 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 CMS uploads and disposable hosting, suggesting it's used to distribute or host malicious content. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

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 http://kientrucphatloc.com/upload/files/11776974444.pdf In PDF document text
    • http://energyexcess.com/userfiles/file/82658735314.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391e9f8ccf2---xiruzojigite.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bk6dpb6ashrh46l56g8423esq/57935061867.pdfIn PDF document text
    • http://espwireless.net/uploads/file/jibisibebede.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/47345266743.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_1851F112485463BA.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03ab94ade---81932819701.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/16423494545.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/nimatejakikekudurifagoge.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/letukovufut.pdfIn PDF document text
    • https://breedlife.com/upload/files/40761157419.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/60382037849.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091405454348.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m1h3olfk97hv0o7s47t5j8cov9/53589142543.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/73400179211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa28daab59---jeralimaxedip.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/daposinanevawesufujotov.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/tatod.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/18244513101.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vunijotaxaxizipetukofam.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/potuxibijepefasamosadur.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631755104.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mapipinerizokopesav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fortnite+escape+room+3+playersPDF 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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 17672 bytes
SHA-256: 8b94d41022b7cd9afe17b7cff14c57007d69ba6621b9c1e9feba68b3625297c3
font_01_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 10796 bytes
SHA-256: 05156ef3bb03d693c9c509a3e80b59308210b4da7d6a44c837bca0c8dd16376e
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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