Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc065ad898adcd88…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 12:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11e9d675a055880704afa23ab7844f51 SHA-1: 72a22d7404ae0b89a85f6eb7e3e4c3d7da2d2018 SHA-256: cc065ad898adcd8812eea291dd9433521ddcdeafe7645cc731651695df739c13
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads. These links are presented in a link farm format, suggesting an attempt to direct users to download potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brilspa.ro/userfiles/file///pupugegoluto.pdf In PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/85087203311.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/79312192362.pdfIn PDF document text
    • http://santeh.md/img/files/mumoxiben.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wimukozipuxesakulobu.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/nixuberuwekajabusipi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/posar.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/87872161312.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/77976666326.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xasomibuxaxisevubawululag.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/nutirodomodivezoderor.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/49772062524.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/jadirotinabovoxafuv.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kejipupofomapumamexibov.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321da650457---63840212670.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_091953.pdfPDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lfusvco98sjq1ph23d333a5i3b/pobemenoxijimipekefuvo.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/41944516888.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/51287615255.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613840b292d51---78471346288.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/gavenugexawev.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109130232465450.pdfIn PDF document text
    • http://prota.ru/upload/files/69551732888.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/75861948708.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d0cb4fbd---xigavuvo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43fe4228---migukuvumuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hopeless+land+download+play+storePDF 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_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 10484 bytes
SHA-256: 4476b28f476418b9cc04d40b96c7fec29b9de8541b5e2c4dc32330a0eca0a205
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 16448 bytes
SHA-256: 548fcf67546ddbae862bd4728d6d5daad9efa947d09f3fcaa27de486e5bb1247
font_02_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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