Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6a923d956484db…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 13:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fad51c418e5b842c1b4483fe78967f8c SHA-1: 93e8ebfca8c700f3b56c0f2edb73edad7d8308af SHA-256: 4a6a923d956484db657ed47aa062ca8aa6e9136ef4e143d48e6ceaf54e53cfeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous malicious links strongly suggests the intent is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://davcpundri.com/css/file/50439279755.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/18141395933.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b17184dd466597524686dc1a61e1d018/lonuguluwig.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a01e7477789833cd6b1434fd26a93b26/fofozimu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6cb7d0b7---zazowuwusikaju.pdfIn PDF document text
    • https://avela.md/userfiles/file/fujawexekamuwufi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4060d18b---lujixoke.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609974c299415---38394932807.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210619_FF7F76A3184E12E1.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607349684dae0---madobujamanexise.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3c96f2f8---wivugunavopenasuz.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/votusodemum.pdfIn PDF document text
    • http://shosholoza.de/file/13761695275.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/gogetog.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/42245261106.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8a506e6---8043574600.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bad668007c0491aa0ddb25f482253220/46377475349.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/4c0b1bad4599b3e7705c8ca5335be922/20265838563.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/97a7b5060c4e46d92c7349d4dd9d8e42/4788457197.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/fimanazilazamo.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/rabadixuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=characteristics+meaning+in+sciencePDF 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_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16936 bytes
SHA-256: 623dee9131d933b9bd721feaa6f672c7eacbb256d0a090673fea3e4682701ed4
font_02_sfnt_off00013c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 10544 bytes
SHA-256: 23cbd1ef196ddad27eb97a5b9ddb014cc966264cd5d4c8eeef34117ed9eedfea

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