Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb780d534f2cb85…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 03:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2aebd08426d8a5aeada96c7380ad4cd SHA-1: 06c2906079b65b952df0dbac06d991c861f0a7df SHA-256: ccb780d534f2cb8516ae93ca449914c50cec5af3c690e40f5ff5012abcea64f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of a 'download' button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further payloads. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://kibbkw.com/uploads/file/ledarovatewenageja.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91976067383.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pikewunijelusobarumatag.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25ba8489---74588947557.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/22623715515.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/55373804061.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210912230840.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/mefixakubudinikowopifub.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210905152830.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210908_422D0B59144D22B3.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/75925305724.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/66292297655.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/34112263031.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/20345629699.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/94962918519.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/26845627147.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf1a68f9f---2693046569.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/kasowuda.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/54b26914b8ccfba9c17800ce7cd5adf8/35800158013.pdfIn PDF document text
    • http://smogy.ru/files/files/resez.pdfIn PDF document text
    • https://designclarf.it/file/24557728163.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/neponabuzig.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/fabezumuxifudidamujowun.pdfIn PDF document text
    • http://lagrupacio.cat/file/73970292515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+windows+10+pro+english+64+bitPDF 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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 18296 bytes
SHA-256: 029023f94282da94cadfcb75ce3b9866506acd470a311f7353fbaab3e6db0ab3
font_01_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 11320 bytes
SHA-256: 3e57fef44a3a7fdfd3038b6e0329f67406500712609bd44bbc1a8e4948d95887
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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