Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee3704a2c7190b…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 02:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 564dec52a8f31ab26be72414c1621e3f SHA-1: 30374b09ca0787cbbb3e11ce716a3a618d5e2a7e SHA-256: 1aee3704a2c7190becb3ef4e9cfe12b002ad51e56c86cbfcd54db368b05c8e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2733f10386---31865449829.pdf In PDF document text
    • https://signika.pl/Upload/file/78091561580.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a12060a04---watunubojuxomojasilobu.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/39427755150.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/60131c7c0c74144ce018009ceefb9334/sipovakizebopofakumujur.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/961bc260256ae08e066cb4695be3fef8/rufovunikewakibumosarub.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e9948d607d43118445362ea5ba0f2ee1/16415013057.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39768355861.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wuredamukafukijur.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa2b72fbb65326b2aae4ef2dfdc8d747/82162241564.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/malaw.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb43d91825---25326611342.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2455f95030---98815760516.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c49g5ue22e61m1r4snot8gupne/77977359261.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/letavorobasulebuzaz.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6274e09da---80544141992.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087deb84b987---zusiretuzinetaxusakav.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/cf9614da45b6144b0a839838356ef83b/6079116713.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7fe212a9---75595915048.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/566d1063ef02d396e0db8e512ad23b0d/42831482704.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4b81bc6d---tobonusikemimona.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/53908525466.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/89035604501.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2606562cf1e75c59ae4baf3451d6a2a4/75697910948.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e7460a91a06c10f0b1030ae4757f42d9/tutagelitudulozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=is+density+an+intensive+propertyPDF 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_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10468 bytes
SHA-256: a54a570669a2d752b77bacf37543051fc77fad480b07b9ad4465b51614f0fca8
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 18516 bytes
SHA-256: 0eb217240386446a8f4c280fa31a8cbedb1dd378027fe10e8727942d976bcd9e
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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