Malicious PDF — malware analysis report

Static analysis result for SHA-256 898a0687313b58eb…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56afc6b37ba4034102019744fa3aecd0 SHA-1: c10e0b29089cb5961f2601a6036dbca8ef595a45 SHA-256: 898a0687313b58eb8d00626c7fccf10da9e4890e83e1491bcdf8a0829c806e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://drafthe.ru/uplcv?utm_term=priere+a+3+heures+du+matin+pdf PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j1705h4tm7r7m7m9ralenn5pd1/fidavirozu.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/31490887359.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c93abeb68a67595745109f5d95acc12f/25015141078.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/68526130308.pdfIn PDF document text
    • http://cmtsport.com/pliki/sivafifoberi.pdfIn PDF document text
    • https://renetravel.ro/images/files/54336092154.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/paganifozujepugol.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/megudoxiguxibebikutufiv.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1cdda7f4---dekelorodovelamajerexed.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3ud8u66251b82jvj9l4jb1pd52/vufamepupetiviziki.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/34245475160.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/liratawobifupexibosuf.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pogivuvewojun.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73063320235.pdfIn PDF document text
    • https://alutat.com/data/file/69037328147.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/sqnqnndihkqshsu7lrragphsab/39018456743.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ccf972860c1bcd46581393e3c9068be/63971774415.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/1582395257.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/35903829295.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160979d3e35311---kiturojituzetizulazuboz.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070717551994.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s7g57t3pu7vmmtirgttra70uq8/1033671165.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966fa4a7a04---12850155670.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/gelupibofiz.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/nukewuwimoxa.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 10868 bytes
SHA-256: 70e1161d08cd59edf3a6fc44dfb23bb540b849d96841763976636255145dff03
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 21340 bytes
SHA-256: a4c8e77a84f11912627e528d061f21bba4092f06ef33edc9c3e0b39ab37d00b7
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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