Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3c72908162c0ed…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 03:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b77bbf89bcb62f26e90ca73b4095eac SHA-1: 1acb4b109b6330a34f27dab036f4fb53bc3ed018 SHA-256: 9f3c72908162c0ed20094cec5443f274b7f6560fedf541e105920fc9ec3e0b0f
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm or hosted on compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The heuristic 'SE_QR_LURE' suggests a potential QR code phishing attempt, though this is less certain without visual confirmation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=better+camera+software+for+android PDF link annotation
    • http://greenbelt.abwingsmd.com/uploads/files/gujoze.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/74215784650.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/legakexulebapekat.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kowalisegajen.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/50192026495.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/47436962094.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/84503179798.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/lusaluvokifuwagoliwus.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wagoxir.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6223214706.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/zumobelurivugegafefosodox.pdfIn PDF document text
    • https://brs.jo/userfiles/files/pisodosaretogigipuw.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/25763790734.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/xivajakuvivebufijam.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/tofew.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lapatenomu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9ea1d3b2---71171222214.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16142198986cf7---fazaj.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161408f40da4a1---30489876705.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/lepipawusesetewojemira.pdfIn PDF document text
    • http://micruts.org/userfiles/file/2220390848.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422549cc818---69126351161.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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 10732 bytes
SHA-256: 62f99896d84f064e96142ecec6237a6c605d104b73994e8b7041d582717a4ec8
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 17984 bytes
SHA-256: 2181ea04ba2e11d40bc012bec5ffc441c0555175e967d3f92c88bd09bac4ff7d
font_02_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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