Malicious PDF — malware analysis report

Static analysis result for SHA-256 b361c7830c143d7b…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 02:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f2771f0762b95f879d2975df4687d7ff SHA-1: cd6ddff7857268b1d0e3b933d842601a8c600d70 SHA-256: b361c7830c143d7bc29e1cffbb7d8c278609598843c9c0f8f45a69b7d2105950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phishing lures. The presence of multiple unknown URLs hosted on various domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9855b7caf7---58377157039.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/kevepevogedesaloguto.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/kuvapetakinefe.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/30875589112.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/38273556922.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/89564421950.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608764ba10646---pupokavaluta.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/40367289770.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/9296535252.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/3216428479.pdfIn PDF document text
    • https://areicon.com/images/file/67398814832.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610558b10345b---21111539727.pdfIn PDF document text
    • http://dso-fuzine.si/docs/29094016227.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/17141426428.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f7ba723d1afe549a30308aebb0fbd315/95472708906.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/37985713183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=break+even+point+is+calculated+by+the+formulaPDF 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 17912 bytes
SHA-256: 97035200e197bc76755c7fb9b295d744a634447e9dac45ff3f84c8e03568b5c3
font_01_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12602 11448 bytes
SHA-256: f8b594310c3c2302771b8ecc078a2b7032cfe2649e2b1c3598b7a774695d4b1e

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