Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb2710c4cbb8e0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 16:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cdcc1650c664d3ffa4301ddc49befd1 SHA-1: 67cdebf4da778a35b280c6bd53b782e2aade1c22 SHA-256: fbcb2710c4cbb8e036e85c4162d625da27393c0a879125014bbc13aa5477561d
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to distribute malicious files. The presence of a 'download button' heuristic and the ML classifier's high confidence score further indicate a malicious intent to trick users into downloading malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=the+art+of+loving+free+download PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d50cb8e1---90632356895.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/52893809287.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nakob.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/33831558623.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db152c4ee---92959096109.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/35324305362.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2d3855b1---refokomi.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xelutenixinomo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e3h8h5ioj4nsqugqk8jhf9pg0r/somamixapugam.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gadaxiserekifetifo.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/55898803315.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36c5df480---49757477126.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/jejipevu.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/nojalililipivanoxupusi.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/davuwovikolupodowo.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091301094656.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4ad211786c011338ae99710999a37334/86317002413.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/70068824022.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/baluroserapevi.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/4669368840.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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10580 bytes
SHA-256: fd2d03ed4ae559916ee110e538672f8bb8ad278c0a23eaab707fd5d76dce2590
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 18452 bytes
SHA-256: 5d769270c1cc278f9911100edb9ba68d0811a9234940a49a548010a5b3f28a97

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