Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5dc3ec6cd6c1dc…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 05:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4526010a704730e88c528d26fe06c856 SHA-1: 4862e61ee0a0374ac4cda258975e7ea7b08e452c SHA-256: 0b5dc3ec6cd6c1dc8d59b9ab2fd96b5a3747ed59858ac57be925c9fd1eef8593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=purpose+of+counter+argument PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608267fa2e77c---1104693552.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ad2r0iamcu6hsrhtqcsqgq9kq1/nedizexu.pdfIn PDF document text
    • https://parfumzone.ro/files/file/82133925914.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63749d1a5d---duludivu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f314858e.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/11357444870.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607813cd63df2---40454366995.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84c9ed169---zozadafel.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6ef35c0ecff7e12d1022908d0f9b45be/fiwojebubo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/45f3cef8886ebdec4d1d451b920a711f/bunuv.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940bf715c5d---28905451378.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f2d675a6---35658166528.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92720a941---gewijudosodujoxafobo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/47566893927.pdfIn PDF document text
    • https://moolans.com/uploads/files/55375345802.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zevusuxorilikavamol.pdfIn PDF document text
    • http://nfc.soo.jp/file/kujobanovex.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e781b401bf---35349073772.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5df133ab---geridurebemomo.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/60511799903.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06b56478c---19618709461.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/15f61437c20ac5489e422e709587161c/runekerowowiniwisir.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/70293738262.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c4cc8216---mavezotanukokap.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_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 19120 bytes
SHA-256: 3b99271ca3e468be9dda03c84285cd8b2cdcdb3564ac22f138f2cf1eb048529d
font_01_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 10788 bytes
SHA-256: 25f262e6e47a1cb415674511efcc37b2eea3276ac9cd879cc9ddc39c525be10c

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