Malicious PDF — malware analysis report

Static analysis result for SHA-256 e804c52e93662ebe…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 21:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 866a5fb1ad3ae3a246e244f5a847cd6a SHA-1: 3f7d26c7727f5ab0e03804cc10f81bbbf6d4b480 SHA-256: e804c52e93662ebe4b184dfdee7491acc737c4c35295ae76f1aa3922c489c534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aspit.ro/imagini_ws/32426086834.pdf In PDF document text
    • http://hoachathoanggia.com/userfiles/file/lezopud.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/mizezenerozofifa.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/49650962102.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wusugeposuwodajo.pdfIn PDF document text
    • http://autodilygood.cz/files/file/21220100226.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/20908768405.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-13/20210913090436606942.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/96062906518.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496d728c403---xaxesozixinolenev.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/64017842745.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/99202940809.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/sinodukafe.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/suzabizafelapizixesud.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/wumedififufufafijesidud.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kexipiv.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/niloripagevax.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5be13fa87---70942252494.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/munomudukijowu.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/nojeg.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/55689513669.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d896bb014---45098313212.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/94302556339.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vasufimaragakisuwif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=d+words+with+xPDF 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_off0000b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 16248 bytes
SHA-256: e214edfc88f6925044f2952f826218bfaff94e8a38497fcbe94769d78a490e7d
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10092 bytes
SHA-256: 7101361fcabfbd194cf1ec10ce639a4d360c1d263240a976644bfc1f81abd7db
font_02_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1