Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb47b1493f94733…

MALICIOUS

PDF

169.6 KB Created: 2021-06-09 17:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ed52e6f739db01514d1d0420d72b49b3 SHA-1: 181dbd5b754431fc12ebab495ef7d75c71eab4ab SHA-256: ddb47b1493f94733eb662fea3c74334e7986a319da83b32cd29089bf205d66e0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=ppsspp+pes+2020+obb+file+download PDF link annotation
    • http://domusanna.it/userfiles/files/suxurafatekomajalujina.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb46a935fd---vuvunuvipowufogago.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bc438379---dadukaduxejofubeba.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160908ecf879b1---50972071133.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b76bcdc8f---rexifir.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/20699628856.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872ba4e2f75---taxajuraripez.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7e9136d258ebfa0a9e84cedb2c8f6feb/54994664842.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c5a86e04---wajidorejozenumekidewap.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba95bd66280---nufasesevelogeza.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5a957fa7db5a19afca1eb453063fd4d3/17933280836.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5661fa3d---sinukanidofikugijigogoxer.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7b3e561e---66865430014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F629 8296 bytes
SHA-256: 7fa9ade92b4aa02740b05955a1b49f8fb3cbcfce356d254b03ee18fa0a27b940
font_01_sfnt_off0002128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2128A 5448 bytes
SHA-256: 926cfd9cba33862857fb5c00da9a90cef682c8793fecd947e644793d9b708612
font_02_sfnt_off0002252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2252B 6720 bytes
SHA-256: d37bf71575f28778453e8910bcfb8edff9b813e911913094357059b9e885b691
font_03_sfnt_off0002380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2380B 20448 bytes
SHA-256: 4a5faf1b3901034a59edba55c8ff35883de03dea7253b0a1f2c05674d9e6aa7f
font_04_sfnt_off0002705d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2705D 22304 bytes
SHA-256: c4ee9c5b4fe61d25e807c784be5a3cedea2e1ab3ba7eaf1bfc02ba76976f6d84

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