Malicious PDF — malware analysis report

Static analysis result for SHA-256 74163f53102e42b0…

MALICIOUS

PDF

92.8 KB Created: 2021-09-08 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b769206fe5db8563b639f4336d432a3a SHA-1: b77433d0d9d6ed187110e37a35f3d8616d215bc8 SHA-256: 74163f53102e42b011da1456efdb01828a88ad11e101cf74e58ba20cc7b2eec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=transformation+of+sentences+worksheet+pdf PDF link annotation
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64b495cf5b5b67a0219faf50f2d9e4ef/sewasatizawumexip.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109071324431911.pdfIn PDF document text
    • http://polletnv.be/uploads/files/89481212421.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vonozusixosavuturipelujo.pdfIn PDF document text
    • https://brod-plovdiv.com/images/xagemolawufeka.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/fe89384a2ce752e10b499616d26193f0/56948425034.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210821191326.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1058cb4a---vataditavixedunirumigitox.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kudizizazuvuluzaxip.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/52f91968ad1af39953f4e6a86528e043/66167718919.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/mulawegoriwatakevupav.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/kaduxasugitonedozuz.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/55517645128.pdfIn PDF document text
    • http://millecolori.it/images/file/414408757.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655825ceb7---zuwivafivilaxumoxirem.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/podikomoganobunuwu.pdfIn PDF document text
    • https://ms02bet.com/contents//files/zufabisofitexilumun.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5ed25756570fa39874c22dc44a4d22b7/letalokinemivavejudejuw.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/buzujuwamikeriwaviwijilug.pdfIn PDF document text
    • https://kuepancong.com/contents//files/92881223430.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7pl80gf9dro2rvlhf85f105peu/6899445358.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/10382478308.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0544c06ca9c4d1474616e410a675d9f8/masozobatikisag.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d540725afa---kosapumesejamelerexoje.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/33984973713.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/84808624924.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_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 17980 bytes
SHA-256: 1a754bfe572e29bc3fca17a8acf2f16324263b119bf879fb6ddce66c5d89ee96
font_01_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA7 10980 bytes
SHA-256: 2147f810d3f1d3fd4d70db920558537780fab2cab2b9f72d9ec516e1d68b6528

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