Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fc1995f0fe9c34…

MALICIOUS

PDF

76.7 KB Created: 2021-09-29 05:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0075049d3e4abbf8b6013be9aeefac32 SHA-1: d27a11f6328a7111d664a0c437671971061e1cb2 SHA-256: 56fc1995f0fe9c3444c6c486665ba5bc2c23f3889c8da2964d8ce0c1295ec2b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://djapm.com/userfiles/file/73925393057.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3b7107aa5---61769452303.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/18659726960.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5e25b9b9866d2cb429ac38bf0f18d2ed/62981311186.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/36803005846.pdfIn PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/55352134774.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614512de508c0---wifajakuloxefi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ha3jrd9rjgaad17hri79hbkkd3/nerozonolosunupufuwi.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/vesida.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/42681851978.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e3c161a82ddd173c031585125ee226e/nukupi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zajenenosemeja.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/66758061408.pdfIn PDF document text
    • http://bulmarconsult.com/files/vojalavavefawegopeta.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/xuxofunosibexuvibekak.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2337657ca---74752571957.pdfIn PDF document text
    • http://huiking.cn/uploads/file/040829221322.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/kurasegovabogalilokevugik.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/fakifiluf.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88375954051.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/tugipukalawin.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/fimalaluzamotik.pdfIn PDF document text
    • http://lovesenergy.com/file/zuzavarejan.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/56731714926.pdfIn PDF document text
    • https://network-italia.it/file/gezuxatopexipodofowefanag.pdfIn PDF document text
    • http://vina2002.com/uploads/files/palajemex.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/zaxedexodubenono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=racer+underground+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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 10524 bytes
SHA-256: 24463e6e255ac6fbc8fe0e8a763f177084c032335fc01a9850f74a2aeebd6df3
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 17992 bytes
SHA-256: e1a94b9de8642e9410dca0a49078579239fb848ab4db0b2ad345d81ffddf4cb8
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1