Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d292b57476838…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 21:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 706676ee1488674bd03519f908452cbd SHA-1: 06de2be0c42d7414d0a656b30167ccb4ce012a68 SHA-256: 043d292b5747683825be9410a2bcafca8343f0eccaa5349d38c60b521efa4561
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=android+draw+over+other+apps', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ketchas.ru/uplcv?utm_term=android+draw+over+other+apps PDF link annotation
    • https://ktmcollege.org/public_html/userfiles/file/zesujosiz.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/takokerowebokimoxawisabal.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/tavedipewedale.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/muzagetegaberapesej.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109031202528334.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/lapusavidemegamidezu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/zaduge.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210908035311.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553dcc7f97---99586761330.pdfIn PDF document text
    • http://mweb.cz/images/file/bebonamegibogefodit.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • https://sealskinz.ru/files/file/rusekonenetusotaranorejo.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904150731333419.pdfIn PDF document text
    • https://hojoairport.com/images/file/84159222635.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/92504438419.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/23985588390.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wusonav.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/58229864907.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1e2ace32---pevidozis.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/67928689946.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/12711742836139dc01c9a57.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94ef6d9d827b66c3fc69d4fa240e88b9/78593094385.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/64851084044.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/48baaa69c3869db8db04c975f97d76aa/98356295767.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50826116150.pdfIn PDF document text
    • 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 18272 bytes
SHA-256: d376d53c296aac87614b9ce363a2b20c87c03c61da593693e4c7ccc0a52fd09b
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 10576 bytes
SHA-256: f257789a645d0dc479a320d1e23b2ef6cbe13974898933c5b09ffb9f04869ad9

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