Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a4a39bc805d46f…

MALICIOUS

PDF

86.8 KB Created: 2021-07-25 14:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52d57a6bc2429520be01b7209db1de6c SHA-1: 6c62a6720d6e05f282db1c4bcdd94b75e9be063e SHA-256: 09a4a39bc805d46f9f69c4280cacbcae52bc804d3c6ac42ce625aa02f1bb0cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fd1dcb00a---54644882483.pdf In PDF document text
    • http://auto-spec.ca/fck/file/5322032869.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088187fc87a1---9832851701.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/68875308975.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/viwemuref.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/168446488.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96652e5de---tujomeganejiruzawox.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160761c127e18f---tawatazaxa.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107090758525526.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/25599451732.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b861625c6---zofak.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/90aa9d342ed9358c11d8d603c091cde6/12478584734.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/i7cs2avnhdnfnpd8lg8fhc05o7/47757969085.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b2552a9d---97608691449.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b01956ea593---dipodenadupefifubaxipami.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/28c52f79211e850e9adbe432b2648f4b/58371608354.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3akab68p57j95acd300h3100t4/89525538345.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750cb991025---60775854409.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fcf4dfd2c---pesojakixupufanijekesazi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d9el34dhrv3825mde45ojpv0v6/dafezamad.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a653b143---xezofisowebarewoku.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s1larn9e18rtbqio37ntfguukh/55545010420.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/80733244777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=miya+bhai+song+audio+download+pagalworldPDF 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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10876 bytes
SHA-256: 7e8ca02b7553780c54ec745008b00f3491f9ea08aa35eeb16fb1b2945e8be82f
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 17564 bytes
SHA-256: 5b6a1486e22e0197c68c948ccb75ee7283c766ea754629dee2d63a222294a593

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