Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d76b0012d25e1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf2be90af31804b504b94e99027d34b4 SHA-1: 57a60ba268f0b3a979e495c86f7c20db14106182 SHA-256: 4a9d76b0012d25e1683875fb62740bf2092c95abc7aa0a5134f1a9a312e65ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lead victims to malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=rd+sharma+solutions+class+8+chapter+7 PDF link annotation
    • https://basisnomor.com/contents//files/72337232292.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c864904765b---ledezekoxuzulinavevidavo.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/sokobaga.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc19372c7a---21118340703.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/3468341284.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mevmc78rrunqn6150cuosbcj42/12835233223.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/96300859607.pdfIn PDF document text
    • https://aaaxxion.info/images/file/segejilividudunonex.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nominafibovowuni.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c36808e7f6452f83bb80c8e5a792bd62/10311965238.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/dimovibixapisisikekug.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7b5ed1274c6bfb27493167fecb65e4a2/3230372343.pdfIn PDF document text
    • https://sanagustin.cl/files/nazopejesivozigejef.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c56a98b62---97473148918.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c0f75d55---nevijuduxemogirim.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6058149ee8---guzadipabowi.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/zipigewirajaruguzug.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a99aa06f5---demefowosifofa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b4454402cf3002d5458bb518be9a0ef2/mikujanabozagiwawokuxosit.pdfIn PDF document text
    • http://premium-t.info/files/files/togatisobutelofozarosomo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1e46a850---bamavuje.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/riguposuratap.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4958e83d54cf3730278fbc94c2ca5829/xuruzokoxum.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 18368 bytes
SHA-256: d32c107bcfbe4ff79df3f3d37dfd4ab9c8a4fd07cdd75e881fed374209314ad8
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 11184 bytes
SHA-256: 19edc837e0891fa28f133a2b06dad72d9b5351711c4a31b52df16835b9fe26e4

Open this report in the interactive analyzer, or submit your own file for analysis.