Malicious PDF — malware analysis report

Static analysis result for SHA-256 b384e4efa5c57710…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 10:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab8f0256c7bff7c7ee9c135901415766 SHA-1: 8df966cc28043fbc94252a5e0398796b13880311 SHA-256: b384e4efa5c577108320dee9321f8f5281ad9473b658c814a14a4786503949b3
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. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hzxf.com/images/upload/File/taniwuwupiwefimojigomutiw.pdf In PDF document text
    • https://divetechmarine.com/contents/files/79464959616.pdfIn PDF document text
    • https://mbbs.hr/files/ripexexolojof.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50506761251.pdfIn PDF document text
    • http://pmke.cz/pictures/files/83774783498.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/rafabugaxajan.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e429e62cec353db11eea095aa7ea604d/nexalun.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/206f7874028a428a7fb7cf7594610f0d/74172159193.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/86729555837.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/8664957274.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rejaweberevafig.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5cb0062456a9ee974c2b6a7b61057d15/21394073517.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tivetimesifosagiwijunuk.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/3361405621.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/jovigetenaruj.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54716164949.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/97378776368.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/kovugumu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/38383196862.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/45697319481.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c8f1f604---gixowumumumafajaro.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/98979170949.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f24a2fdaeb5bc25a816484255c9bf9b8/ditugovexez.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1dde13a512579b6b5ede72631dd58825/mokojodewinufujamupif.pdfIn PDF document text
    • https://kenadong.com/contents/files/52859644897.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/julojipolerurifekitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vidmate+apk+download+for+pc+windows+8PDF 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 18120 bytes
SHA-256: e13727fa798b560a8f77c1bb3adbc0aa132c3cdbdff9ac8ea0cf8127d08b2580
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 11136 bytes
SHA-256: 88a25db3ebef41bb2175fe7424b89dddb23cdc9d9c2c12df6937a114212545c5

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