Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5ae19234fca99d…

MALICIOUS

PDF

76.8 KB Created: 2021-08-13 05:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a039d56fe327c4bbed3a0d1a2cf20099 SHA-1: 06e6aecf632a8e2000cf07003c289108ec2932c8 SHA-256: 5e5ae19234fca99daacae7682d8bfc7367daa73553e9f6e84204021de0c281d7
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, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The primary goal appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fh7baf07urlboaio400plud17v/diwupawagowun.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0b7e0774fbc0c8877686566e55441e64/xewem.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67768069274.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/q3gukvoikbhaiv53rutvgc2f66/loratasovebirosukakow.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/rotijibuwi.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/fawop.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c281ae89921---24636583360.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/444j5co73s2ebe0jf128ldsbfd/11687449813.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079687b3b675---donedigabigesaz.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kujalujobaro.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/2527005844.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/mufezonureg.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nejesuwijapevusuxafep.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/nidomutewabajevirit.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/10409798630.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d80b914ab---nibupunul.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5957049c---57829513626.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a6d92fb---10293549493.pdfIn PDF document text
    • http://orem.mn/uploads/files/pulugorivovoto.pdfIn PDF document text
    • http://gdgom.com/upload/file/210705040549291759jzcui1xw0jtb.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xovarupisefojulizadudeju.pdfIn PDF document text
    • https://coil.hk/upload/files/92109578418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=1-11b+measuring+angles+with+a+protractor+worksheet+answersPDF 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_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 11228 bytes
SHA-256: 562f790c9d330d509b3eec277064f4bc508c8856dbe328d481043b0a3548718d
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16232 bytes
SHA-256: 947e6d86dbe01b29fa7a7996c5540ffb1f00a8ba72527e19f5e46061321f24e4
font_02_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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