Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94c17863c802684…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 23:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf93b712d20388235f3d950f465d15c2 SHA-1: d9a7b59d06b025cc35b19ca4f4bbe30775b47a19 SHA-256: c94c17863c802684fd0f5c7ef30465b158a8aa1c05618bdd81f396bdf8901d03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs further supports a phishing lure context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=inshot+app+pro+apk+download PDF link annotation
    • http://synerfreight.com/syner_upload/images/files/jidafalumazawugituzimofem.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/fugupufagubotibupojirola.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/73765629584.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/52518661773.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62db79d94---98241854592.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vizutata.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/46877224460.pdfIn PDF document text
    • http://stonebreaker.at/30030505728.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/67928748192.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jofuwubufunetuxi.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/lokigedenutuge.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109041027372340.pdfIn PDF document text
    • http://africareview.in/userfiles/file/83521257156.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135258e45476---23732334532.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/88809549582.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/vifodofurefukoz.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/remunikazupoloxikalow.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/zezatosizezitaze.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/fagolafusesede.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/95733449642.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/6790182120.pdfIn PDF document text
    • https://medpressa.ru/files/file/26609525334.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/68706355973.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f32d2c637afdf5641fc0bd7a0efe8692/66214771554.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/3922089542.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/nesaga.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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 17792 bytes
SHA-256: a0fa9d13184dd8580bd2ed723fc6cfb70c95bfcebf1388f8aaba979b45126381
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10392 bytes
SHA-256: d14a35ab6775b434d10c539cf19a12924ac9f769b43f66e35c45c1c52823e364