Malicious PDF — malware analysis report

Static analysis result for SHA-256 947b579bc83edcfb…

MALICIOUS

PDF

77.3 KB Created: 2021-08-17 01:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2331ded96846e0803dddee71e8e5f70e SHA-1: c7d843b15e1447423547117c307cff1e8baa2ad6 SHA-256: 947b579bc83edcfb2645883e5027820b83b6b969ad17c5e2ae419981dada2448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The primary attack pattern observed is the use of a link farm to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9df70993cb8e8e6af6571c51ca927387/dibajiw.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/bbd55a2ab2120d783b7707964acf47e3/denakomowezuzodisip.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///33222912362.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a4fe65ca2---savozox.pdfIn PDF document text
    • https://renault-service.com/userfiles/bikiposel.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fovuvexapi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2603153f75d55dfebe216d1adf58443/88537996759.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fuminagatopepukasiw.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/25342945194.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/rerijiruluwimirilasod.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lenasitepukixe.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/8e43797b7d2998a85b97b9058c25232f/56987633611.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9fe3ce4f---54824466521.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e6f15801---sidupawi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a7f3e72a9dd361d1bc3dfa290b623c6/66264009160.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/v4mo6o8qcrfqlqt4jh0jdqfqjh/24780806116.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef2fefcc7---8408314074.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vutomora.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/167fabc2dfce34d4ab1666a226f7188a/18237623476.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/47822769238.pdfIn PDF document text
    • http://ymmicro.com/files/files/pavasotixefoxikekis.pdfIn PDF document text
    • http://industrialdevices.in/uploads/89955648591.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d4ec982f---19581825942.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4422d31cfe---kuxadaniwazug.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/894597e0e9e1c329faaf5394066b4edc/91684339468.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/13051147326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=baca+urbina+fundamentos+de+ingenieria+economicaPDF 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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 11068 bytes
SHA-256: 136396b91fa940a765cb6dac9bb030843106e1ddbea92fc4b6704b0261de8f15
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 17348 bytes
SHA-256: 91922bb493e1c7f0712929f6107af1302f09975a1c0f6bf2b1520b436b70375b

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