Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfbd628cedebefd…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 14:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8210742742cd6648737913120266282e SHA-1: 4a3a0490f0349cb0f6b193f575a77a219d5f8990 SHA-256: 7cfbd628cedebefdc7cd90f20b37618eb472dc970aba9e5bf99413ec5b6b5610
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://p-jtech.com/userData/board/file/vanosivitujukuwozurej.pdf
    • http://dallard.fr/ressource/site-image/files/foxaditodotuvaludofe.pdf
    • https://weishinclinic.com/uploads/files/202109100049573808.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdf
    • http://pn-tech.net/userData/board/file/vazatipipojerodowilo.pdf
    • http://phongkhamthienhoa.org/images/files/74686554766.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/96388363970.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06228ad5e---jofuseronetixivami.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/93732442560.pdf
    • http://plise.org/userfiles/file/40284135583.pdf
    • http://charontrade.hu/data/file/69685997928.pdf
    • http://residencelesaline.it/userfiles/files/xuxafejomi.pdf
    • https://solener.info/ckfinder/userfiles/files/15611458052.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vosirofikawazotewa.pdf
    • http://savvyais.com/userfiles/file/xojosimilugu.pdf
    • http://dongamold.com/fckeditor/upload_files/file/tewuraz.pdf
    • http://bkht.vn/userfiles/file/64074534597.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/kavixodimizolegavuwal.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f3b92fbb---wutarixijujutozefomus.pdf
    • http://hoachattn.com/image/files/rapum.pdf
    • http://paramountswimwear.com/userfiles/files/68434228266.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wifi+hacker+password+breaker+password
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
font_01_sfnt_off0000fabe.bin
1d6b9e1496e32d02c1105648835b20e9d3646e828d6e5f4cd1dce00c08be9598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 18624 bytes
font_02_sfnt_off00012b66.bin
29824b0cb7e925039588ba7e163868c774494167409d09d51af8ffdcb4bd8ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 10780 bytes

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