Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8c316044c9f67b…

MALICIOUS

PDF

179.0 KB Created: 2021-07-14 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a7cbe78691a3dac22fece60c6297232 SHA-1: 5cd97479dfadd16dca4345709668b05749472666 SHA-256: 0b8c316044c9f67b303ac0d7f2cf29a7c8556f600e5b95aa87c501b155bc32c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The primary function appears to be acting as a link farm to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://gerastar.com/userfiles/file/kexizaloputufotif.pdf In PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/35102312921.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/porefogugogos.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83927228382.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1e327433---3513314508.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/najizuzosemenodejigo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tekeninekere.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zomenuv.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d531d8e94---47909408133.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/13388764972.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1939125ed914f7682bfaf2201d63c2e4/gegumugogiboxolivegotike.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/42586592094.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/doberipupu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nabowaruru.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/93033889507.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/vibas.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/25833796736.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/19adb084597415375932ba86cbde8e6b/4033691418.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/57631242.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c37bc73c727---kudike.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/17390569962.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/61474083602.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8om4ukv9vmrcgmq9eb7cut9bu6/telexomeliv.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b03ef5f6d455153f9b7acc372ddea6f8/35509655250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+bible%27s+answers+to+100+of+life%27s+biggest+questionsPDF 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_off00025e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E22 17688 bytes
SHA-256: 54f8153008be7d4fa239c73dac50ea56b0f6bf81811f9e177c8815316dc5c8d2
font_01_sfnt_off00028c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C10 11136 bytes
SHA-256: d0d943c4c0fe80cb274f59b3556c5a79b91bb119417dd939c2bff760b2c80df5
font_02_sfnt_off0002a5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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