Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e126afcbfdfc0d…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 987082ed33186e4753bc8a33337b0efb SHA-1: 33100000a3240cc3b8154e5d8d5686b3545b4b25 SHA-256: a5e126afcbfdfc0d327f69424e0aaa3197e290d7ca39f02c52062ef69ae0737f
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy with multiple URLs, some hosted on compromised CMS upload directories. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hsbofmn.com/ckfinder/userfiles/files/13440836136.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f1e1d8457d44c1ba23d72b76f96d54a1/xebefofajilipoxixululeto.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5945ad1e003d15565c438f2607bc5025/rogupopamif.pdfIn PDF document text
    • http://bdn10.cz/files/file/50796576404.pdfIn PDF document text
    • http://zae.me/datafiles/file/66923273771.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/kuwugazaxekijowazenu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/dedizanuneduribi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb929e3cb---43969540880.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/3161467283.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8d4fplvc1etaabhsu9gnk4d7e6/36549961339.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210709114134.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2dad6b9cf---gazonabenofefo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vonuvegif.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3baa2b31ac5e0d42e7fe0bc6907f8161/89749899481.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jifese.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/1231039061.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/dazososoneresimadabirig.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunidotut.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa80ed07a---zawazusoxenokuwafozeret.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c4526ecdae9635a1579e08994dee333f/mewejiridekob.pdfIn PDF document text
    • https://songhong.info/userfiles/file/61196048200.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a924592722ceefd8762ad8eb84a2fcc3/xiwopelaniwinakafeza.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070478f15acf---lanigipidejezuraramuno.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wuvipozejoropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+write+a+birthday+invitation+letterPDF 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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17968 bytes
SHA-256: 407bb01cb27f6d1138f7d418514545985fad10e9edcbfc1778571393ef17efaf
font_01_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D8 10676 bytes
SHA-256: 855efae602bdd046b1ebaa31ab6bf1d06a7bc8232266df3b1878129624e73011

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