Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ee182a96be53bf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04a719276e918d4ab45ab8d5fbbfac48 SHA-1: 1c7001397af9b070db8773de9e1c03f9b2be6752 SHA-256: 19ee182a96be53bf79b7605e941b152c5efb4decf3b336edc3876e61e468cb04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, many of which are hosted on disposable domains or compromised CMS uploads. The presence of numerous links with 'utm_term' parameters suggests an attempt to disguise the malicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://csc025.com/userfiles/file/20210909114921_lcztoa.pdf In PDF document text
    • http://morecoredesign.com/images/imageUps/files/kiralosojesipupi.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070813033844.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/nufetuperabubiwera.pdfIn PDF document text
    • http://benrassam.com/uploads/files/koxasamakav.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae0226e19ad017777bd7fe0b176ed6c1/10495150201.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904130911_1hg3gd.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nodowepiriximatukivemeke.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906225943896685.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/83958260747.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bidonekisek.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/19276607070.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/87044041462.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/jasefelagujukujawa.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/4022019213.pdfIn PDF document text
    • https://zzwgjx.com/d/files/39085104559.pdfIn PDF document text
    • http://torgoborud.org/images/file/53621148703.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210902_B2958ABA89EA6259.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/sasefuxosadasi.pdfIn PDF document text
    • http://baoveantam.info/upload/files/29172383144.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gawedusifemukavuvuv.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135708f78abd---53300485871.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/81579510255.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/97617955616.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/6165739999.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/buzasebuvelerume.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613737929df47---45786705295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=astro+go+latest+apkPDF 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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 10304 bytes
SHA-256: 3788671c48c1c29eed06a3bf7d074c553c26aee0b2656480fbdeb90129e21cf7
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 17996 bytes
SHA-256: 895fed2ce0d4fd820d22b8eecef1fe4fa4ff38675f9f7637585de32721e6eb8c

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