Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec370c2883e9693…

MALICIOUS

PDF

116.5 KB Created: 2021-07-23 15:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2e186c6d802104cd6f22d3c9e1f5e1e SHA-1: 62a02364e640df4a5730e7c4942f3e0e500cad69 SHA-256: 7ec370c2883e9693164bfd55a487d7ef4a24a12ed29ded558b611da89eefd26e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pristineleather.com/userfiles/file/49812944916.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb987922fc9---36995076275.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/67442975197.pdfIn PDF document text
    • http://jaatkinson.com/userimages/40283126735.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/sepevapuxonojomaxowalibiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160972acfdda08---45556617038.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/662c532f4d82d2895abec6a61d2a3552/pomipuvitofa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f5871c685a5121eed797f50b68e0df23/6521070213.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/dinisobogujovez.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bc3d201789d616e5e30a0f947ae23088/75307573347.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/wusidufefi.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ebe9bc09---jovajaxu.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/858910719.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/sizuwupofisobal.pdfIn PDF document text
    • http://araonline.hu/uploads/file/lugigikusopalevegoxatepu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a6378bab---sodomi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f93d17b1b201f466fced22d4a5c4f98e/gotedulumeroxukolujukuze.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/24098647060.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/60469350028.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8d9ec027793b97f2447e7cd160fec718/5649136759.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/67960068920.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/5740278846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=importancia+de+la+textura+del+suelo+pdfPDF 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_off000161d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D6 10932 bytes
SHA-256: 577776a7b6db1fb4bc2fb0f80a5fc48df9a7f42e4c40f988d7b1e57dba305e56
font_01_sfnt_off00017b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B23 18060 bytes
SHA-256: 412259db8a54731e3e2b612ea14fd04b383bc04feb102b86b686853ed0558035
font_02_sfnt_off0001a8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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