Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6de7a433b2a6f1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-03 13:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f085128c77c802021b77637dae12f88c SHA-1: 4484ea2d5ffd48ced3ccffda464aa50adad3a5f1 SHA-256: 4e6de7a433b2a6f1dd81664936fccce1c509c252860fb1d546cb06964f334dc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external resources. Several heuristics indicate that these links point to compromised WordPress sites, often utilizing form upload plugins to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malware or engaging in credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa466c66b4a---28796821940.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/dq0eogngobe8cah30g50mof2r4/44562002274.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/tekkapalkg0hrp80craikoccir/lusirorixile.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160829ae348c20---bagirokiwijuxurodo.pdfPDF link annotation
    • https://neksav.com/upload/ckfinder/files/xawawil.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160741b09795ff---napewifanovofavo.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/gatovodaw.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/60639737383.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1ml0g5m3g4ckqf6i6b6fp8fnk8/vaveli.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/22588475923.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f4d23002---fimaferineluzumanugaraj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a6103e5480---xefopojadigopaxodoxabelik.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kuzevisu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/70839429588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f5f5d84aa---44691609587.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/dosizebe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b904a15afe7---sowaribasimewibo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607712c62b99a---lipinipunazu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/88159057021.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/17078539264.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/27770805707.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b97f1872883660a309a8524dc48edd63/tikejolelokepovijara.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9ef051a7a7333fcdc95d9369d2556dd7/44273979476.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2ab92e25f80f9267e0352db028dd79a2/30518783926.pdfIn PDF document text
    • http://gabortech.com/admin/file/7325053993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=formulir+spt+1770+s+pdf+2017PDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10684 bytes
SHA-256: c215afc3b91d9c5785231b018614297b29c18a874104a305e020f299013c6eaf
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 14320 bytes
SHA-256: a8c55b63723b419948df7c98b2793ed8d9a75c61f7b4feec0517ed3ede58251a

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