Malicious PDF — malware analysis report

Static analysis result for SHA-256 49779370cac2e13b…

MALICIOUS

PDF

148.9 KB Created: 2021-06-25 13:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8c99c9142b3a246f55bc1647c816a7e3 SHA-1: 237ff1d5ddbb44c8ea8e8acb9768e8cb77682340 SHA-256: 49779370cac2e13beca934f46072410d67610f2525104771d4dd19bf0e539b0c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://oniceh.ru/uplcv?utm_term=keep+watching+over+durin%27s+sons PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cf6502b3---kovavizixodebi.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/72127280669.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sewexenejefunebeguwoxafe.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/bolizitelob.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/rujeteziwofagu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b101269c70---dusiv.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c28c6697---8878011300.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4889a527---34649400390.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22647f04211b298cb0fcac337492be6/68358922644.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/73567064114.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5rc6pund1k7j20n4100mtdhjp7/daduru.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/21087261560.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c232eb09df2---jovevoj.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d0065879cfa306e8028263433056e398/24858593073.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/849aeadff2e15fb01d10afd9c6589c77/27836432703.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d823356da---zexiduvi.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/14643938443.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba80cb26e---73277288248.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 90620 bytes
SHA-256: 852ef4fa62261458d379890f2c8f2d65023798f0fb97bd7a772bfffd18eb2d6e
font_02_sfnt_off0001ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA31 11024 bytes
SHA-256: 3e5fb958d73a3814f53638abf481cc4b81a7bc5eb0dea1afbec7e495d8974a46
font_03_sfnt_off000203b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203B9 16772 bytes
SHA-256: 5288a337f65eff935d964b950cf159fed6f456bb554c74f6c16715e2abf8c55f
font_04_sfnt_off00022eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EBA 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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