Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f924e9ef86b833…

MALICIOUS

PDF

107.8 KB Created: 2021-08-04 15:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be045757770ea59ac3ae6be279c3686d SHA-1: 6aa8a810a3df47e41d984b2bd098ed4a12d62811 SHA-256: a1f924e9ef86b833a75a2860038be90c4134eedc1f2e945ca4d32d8b50632cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://wastran.ru/uplcv?utm_term=maserati+gt+manual+transmission PDF link annotation
    • https://tsafar.ir/basefile/tsafarir/files/nesoremivuj.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/medumedikoxesilofupal.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wevonoxegoripuvupe.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce49e1f1605---98731212335.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a536d25a---18972073013.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xarokufamilofu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/v6n5hjop9k7npjtifvpti7rvv1/67506341826.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/84133550873.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/13fff944b05d690b086eb7a538f5fefa/51525942377.pdfIn PDF document text
    • http://babamoleskine.com/files/file/42725863478.pdfIn PDF document text
    • https://kopari.hu/files/file/39766459063.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb9af5d0d8---gutafomumon.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jcbb28ioc1j37nbp4d1ccu2cqn/58361949445.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/zozanegosotar.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/86535403565.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05e766e49---52268154129.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/puvabolokupan.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/92729467827.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/51790679885.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7952f6c50a---59484847244.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f755c918d1c9f91923b443edd36644f/rolivemugatekezokap.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vlll7d8j5p3m2ki9h029qk971d/lidiruxiwapefawisojesub.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e582b495d56745cebbcdec9c5cf8f7aa/salafopimewazitumadefogaz.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_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 18496 bytes
SHA-256: 2f6362369d1dedc5bb2d0001fad4e776a340ef9b355a4ee77a5332977fad9f12
font_01_sfnt_off00016f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F25 10544 bytes
SHA-256: 638ba1223efedf1187c2e3e65ca8acee48ef9588bc874602d44145ac460f4270
font_02_sfnt_off00018730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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