Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5ace3e3cf053c8…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 12:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d4c3e7aa425772373bf29423a16d710 SHA-1: 3f95d70084dc488f27b1dc96e29dee2f99a27009 SHA-256: 7d5ace3e3cf053c8f7e39487cb01bd3c1e81b485e4e46d1f293c3260804b7a21
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://medvor.ru/uplcv?utm_term=attenuation+meaning+in+english PDF link annotation
    • http://elementsgogreen.com/userfiles/file/tudesuduluwobipufuxalisa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cbam2mu7tt5t8rcqvvn03qc4o3/zatitagorugo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o9fk1n944lr1a0hf2poeed39fc/lowudapogi.pdfIn PDF document text
    • https://capecoralliving.com/media/file/jifofezagejonaxaf.pdfIn PDF document text
    • http://charontrade.hu/data/file/zofilonepiwonodofewira.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9ce285f2---2069378493.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/46858293971.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d50e76b82---52459462818.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c5488a3da95a9025e7adf18317402547/30486024769.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed92b3cc6---17945483618.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210611020612.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/mijodukagevivaj.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcef0b188b---22043432077.pdfIn PDF document text
    • http://chikatere.com/Upload/files/6180073370.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4379c5cbdb---16920267074.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9e629e55087220bd18ecec5ab3f7459b/52543244767.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d51e4e6ee---sovizorabewa.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/pawufutewovudalanumiki.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/nafafeva.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b4d3de97bc4c245078ade739f2950c2c/21774957686.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/74038355005.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a64cfd8f2f2de0a099d9b949431b6139/xadigexorise.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/30956593934.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732bc6be202---mupizuke.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f6c0f2c05---90476661959.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000de6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE6D 20120 bytes
SHA-256: 5733c2c69fb26b48a3f48e7e8071f1f3ead819c7390268f90f29895b3d242bd9
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 10536 bytes
SHA-256: bd7fdf7ea9a2bce04fc2b99494357899ade49860b1e4e72b4b38ad6272ae813f
font_03_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 19196 bytes
SHA-256: e449b5b841df61a84058ce90cd468dd98a5b43c84dabdca640301e5fa4cb29d8

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