Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b12b0b77b9d5634…

MALICIOUS

PDF

80.7 KB Created: 2021-07-18 03:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d30182395462d7c6d57ec1f90afb4a9 SHA-1: 2855fd573e1940bd93cbefcdeff5a6dfb2b8006e SHA-256: 7b12b0b77b9d56344aabf07314cbd5ef33aa07fbfe88313085bdeb26dbe1b81a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and a large number of links points towards an effort to obscure the ultimate destination or to distribute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e6c0ce00---76997635630.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074210b69049---36788550306.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/63501898515.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cbb66bd42---sobamod.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/563f21e6f50924aed39ed595faa3baa9/35875066751.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/sijeruxubezawuduwaxalem.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b2h9dghgfper1s2gfsj1piv5v8/44851252070.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/d0cq1oluqccco1eipcbsl6kbq6/vuparovebigetaf.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/linav.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/lusagogawemipasewub.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/widizufined.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zimalime.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1e09d61b---1104064742.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0992dd6cc2---zinijoteretumoxiwoja.pdfIn PDF document text
    • https://isleo.com/i_photos/file/65191573529.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1ca836ad0c9f9d5daecddc351a28e096/28008170050.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fa75d12058a8b76fde809ba283e44e78/muwemopumuluximivuwag.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kixipizexuvawuditux.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/mevaz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab42c0b3375---15601159373.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/39820504868.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae722e0093---jolilefimososux.pdfIn PDF document text
    • https://ip-pharma.net/data/files/kisulejelesufesosuxow.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7c8f7a6a83820a3765fb9239fc52cb22/dijevofixuwopatovoporagab.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b542ed5b163---tukelarejozegefizatax.pdfIn PDF document text
    • http://newo.ru/files/files/39026836444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+lost+legends+of+redwallPDF 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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 17800 bytes
SHA-256: 7ab62a8e724b597f41fba2e1a81d7e99ca272d2440a4fe15697fa56373acadba
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10592 bytes
SHA-256: 7a75229dbcf3d3d8bd4bd4dbd86ca5e66290a95c274bc905c76be546ab194223
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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