Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4918a97ff5f093…

MALICIOUS

PDF

78.7 KB Created: 2021-08-25 17:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ecd7424792a1be949e2afc8516ae9c6 SHA-1: 691656d73c6204ef8d455362cfbc9b399917a6ec SHA-256: ca4918a97ff5f0935e6f24eecf6239449461e5bf5068a555ec080d5e5ba6cb6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the link farm structure is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://oroszvilag.hu/userfiles/file/36188057655.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/58137333089.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/1050572775.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b5rmvsv70u7vljqisob8bp4s6r/15091976557.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe3a0f92e---xovezinunulul.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428f78a61---13103327703.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/981290f99b706e6cb5aebb99de3586aa/97298104640.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fidarafudosumijaxes.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd1a58432---47888248677.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dm99tvbd6ouc6cabfaquqs8da7/2593550451.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/34083494019.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/baac1a6f7e6fff9ce5a3c810928f0eab/nexezosujunokovojidikokij.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/14d46c96f16770351fd46818a8fcea91/96622098218.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/16458118871.pdfIn PDF document text
    • https://nadamasristorante.it/file/83737311140.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2380d5226d44b73d37c538eda74d2d25/rumusanudanejujut.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/73d00353fe87cb99835c6b96f2ef4ce9/91793244456.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e370926ca4d---nisedadukubupej.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210519132546.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/fibekivoxafazun.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/9485959004.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/ragesenudozemeveka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8758519897---13818495864.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f76fdaf30---94864255639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rave+up+meaningPDF 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_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 10276 bytes
SHA-256: 156c3eb0a98f3fd2cc184621e1c828cd3b7adfd529e25f96fc683256bc3cb786
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 17964 bytes
SHA-256: abedb08105376f4c3296d3426877f981e8d86c502707a46ea54f92710ca19c24

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