Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e283d593269a5ec…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb6f178f42b5651c4632cd4f141f1e59 SHA-1: b9ad7040fcac37e3cd86c669c8cafa8a7aea3fbc SHA-256: 7e283d593269a5ec8eec3605cac4c7d337cfbe6354e2471eb97db044c0ad0f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad909ef16ac---rumibuvipasamavomoto.pdf In PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/tuxiduziramojaret.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff9af1c04---kututadeje.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d71dbac140819eb6b1b3079ee2114ddb/55898897243.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uaqqfrrn46rb2cieatm82bl2g2/41636106256.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-18/20210618015153321019.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/42291840919.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/edpfdq7bdifr3nvll98eo4jdo1/bifupivo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/27233296194.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sunajela.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/gefipafolipevuxez.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/165762371560d1eb6abe261.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7acacd872---zogomefodapulelade.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gapovuf.pdfIn PDF document text
    • http://gyobel.itpublic/file/50749109745.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/75264255950.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d6b7be2f787cd7ec964bc9a4b146a7c9/8736954683.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49b41b487---36674095322.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6d6f08a4fb98ed301860eb6ec5b2b3c3/sanodogupub.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838beb02009---60800236373.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f33d4d7b69587273b457ab606432fdcb/55121232551.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0ab38fb6---48117059625.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-15/20210515155518843075.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/30760812515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+coloring+book+for+adults+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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11084 bytes
SHA-256: 52910db28411a54b67fb73042ef6e2422f155d12907e83023903bf1fdb7ad699
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16952 bytes
SHA-256: 758299b8a3a45c1403995f6e171a8b9152bd26c07750a61174db02d5955e1d70
font_02_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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