Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afc18f844c10211…

MALICIOUS

PDF

88.3 KB Created: 2021-06-14 01:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1fb84ccdc2062ef8212aa7735da2d3cf SHA-1: 9bc9cd715ffd5e1e39d8d43d28d500dabbf36527 SHA-256: 7afc18f844c10211696853292bf94e91a8d432a57b76372737eb02595469eb83
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=mxq+pro+4k+android+7.1+s905w+firmware', suggest a lure related to firmware or product information, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=mxq+pro+4k+android+7.1+s905w+firmware PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc65b4067---740831436.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56d87ebcc---7156754589.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e53244a42---12112470183.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a443c27bd07---58105954233.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jvghlr3s1frtd1smr8thprdu13/basisajebutoxikobudowepum.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea18bb3fa---55093952624.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/459611889.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/posewotavenetu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91fae2748---wofema.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/f7e4e00bc5c7fa618a2c7ea30459c39c/wakalajusam.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/dujetafilezigebutejo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160baa2ecb71b2---parufevepupawukoni.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e078b30d8f---popemoxe.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/70838777843.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a258c12c7c---puwupagexozokerofuriki.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/fobusipetapusisetogiboma.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097284a306b3---87619753444.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 2888 bytes
SHA-256: adf32003828e0940dd70a9ab198bdbf787bfce6d516b45b646911e816e1ab742
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 5892 bytes
SHA-256: 65dc6d34ea74c47e50ef51d6064e8500bfc70bb70cc942143871ec921a3f11f7
font_02_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 13272 bytes
SHA-256: 145bcf89a0dacef5ce8ff20b1987c0d1fc10e133dfe20cb3270644654974f3f5
font_03_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16292 bytes
SHA-256: b2480d583b5ff525fa3e8f329bbb5a2b88e3c29b31e29cfb1fc97b8aca24efc3
font_04_sfnt_off000144ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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