Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97cd02954fcde22…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 18:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b09ed1b04b4dbbc8350ee9587088cf1 SHA-1: 2c078c7df3cc3616dde43fd18641e631bd7ae542 SHA-256: c97cd02954fcde22f17cec893339a7cf71821be9d9819357c8ed74678c405f79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5c56ced915cb25dbbabaeeaad9621ebb/41720811306.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2b8bb3c14---lugunudut.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/vuxitozubesirizadezatabo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/45119083695.pdfIn PDF document text
    • https://senhewood.com/d/files/biteropaduni.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/044579f2d405738ff226d5476e27e047/36467856215.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/timoxagumavudu.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/lowokatigofu.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojusirubaxedovug.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/96330343898.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/nojenuf.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/32114845428.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dugite.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/tagizagek.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/nitajolimirifafuloz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/65936555646.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8e3bb4e9---59395603994.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be78c935745---tajonobigoto.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/44333162549.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44e14f6cb---jokekal.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64412530680.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/71165717589.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/kupoju.pdfIn PDF document text
    • https://loctra.net/userfiles/file/85062620949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tipos+de+bilinguismo+pdfPDF 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_off0000c66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66C 10684 bytes
SHA-256: e62191fc411b657ec86d6d7fea503ddd142916306c90ee4d7ad1abc220b18019
font_01_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 18508 bytes
SHA-256: c096f0d7a83af2e57f959579132460b675646ba83000a0ae36de5d41cb78d0cc
font_02_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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