Malicious PDF — malware analysis report

Static analysis result for SHA-256 3380f3ceb247731d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 04:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fc34f15638ecf15e6e9da54cdbdbcf6 SHA-1: 3384f6362c9a8718023c981b297d0857b849c33a SHA-256: 3380f3ceb247731d01ab92bbffeb68ce08435c5b2c3b80cc0aaf5f4cc24c0afd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, such as http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a97d21df---zuwejojovuronijajufigiv.pdf, are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dailymaydemtien.com/userfiles/files/givegeva.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9243aaa48ded83570cdcfd1433afdf87/54510180143.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/9081120547.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/85317497898.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140136855bcc---fugokoletejetugipojisoji.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/27208716178.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/vabiselemovalupolosunig.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pogureboburos.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/pezimafazinoko.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ribisinig.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/94428851520.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a97d21df---zuwejojovuronijajufigiv.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9fbe99a1---29386175123.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109041614272956.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/buxopaji.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0324f25fc6f5f1b55cfb5fd673c22501/18165507548.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ngeoisjntmmt5s5730vkh9p0l9/47713843319.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/18865175770.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/risele.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/6130389286.pdfIn PDF document text
    • http://identik.hu/editor_up/rufetinawaribunonareze.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nirategufebomorixex.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/vibiwurogiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+night+porter+watch+onlinePDF 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_off0000bbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE6 10536 bytes
SHA-256: 2a6a2c2539698f2b6430f530cf53a38c940d252b961fc1bc379b3d455501261b
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 16892 bytes
SHA-256: 52b337e4071d18db31d1b01d2698b733bb456e195e527339fa78f01f14ef2d8a
font_02_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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