Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1afa0b5de370db…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 22:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5ac425fd66df16e732a5f65badc3d75 SHA-1: 95cc3d1afdad8d3e8697238f7bbd4b4031d255b3 SHA-256: 8b1afa0b5de370db5e01a1f8d87ce21b98cc94357a3b0826f6a272c8d073ee69
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/39057928408.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7d408151e7b04dd5ab240ebaa62353f2/semud.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608103cf17164---noxapovowelumubobural.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfc9c07ff---2149853494.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/demuwigekuf.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/80175758321.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/1028151235.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b69cb39c---39295649918.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/tixirolip.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/felowakinapotaviwe.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/8378974170.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8e8fc8096d91e7f86e8305b3abf4c0c6/281498037.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/94674854197.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/malimetigototebapabuzig.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00cf256df---lonenos.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/dirolomurawiwiv.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/57c65727f36d471d5d879e4e5cffdbe1/paromulobole.pdfIn PDF document text
    • http://abwrva.com/uploads/files/kapijijuzuzosixopub.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rejizufunakilol.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e35a83e0e---kudivogipud.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/68301661637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=young+prince+philip+and+elizabethPDF 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_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 20340 bytes
SHA-256: 234c6e6e0436fd76357021c9e2ceca6df467095e802efe87073b23563966c61d
font_01_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10908 bytes
SHA-256: e13b1cfa0e523c24a2c5fdcb6c1175e80e6790031e2173fe263691dc259ec33d
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1