Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3f7ffe13b2e6a5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 22:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50e85e308be0ddeeb7d0dbc38e794b76 SHA-1: 7e919ab05daff2bb356c7af32b8617a349571085 SHA-256: 2e3f7ffe13b2e6a56abf2b0a2a238bbd9f8d3da81c2998fc527b38232472061e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites and a heuristic firing indicates it is a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=asphalt+8+mod+game+download PDF link annotation
    • http://mdknoodles.co/uploads/files/sufemonixuwuviviboxusus.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/dowokunanedebivofofidob.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161358ed7504de---42652960028.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/edff2412f686a729bf60ca97931ca049/70237264704.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecc7352931---vazuxololoto.pdfIn PDF document text
    • https://shevian.com/images/file/pipizikekaxuduves.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/94538123040.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/zenav.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/38968786308.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/bologimikezu.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/biriweb.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/luxewoj.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/22800979529.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210901090634.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7f855df03657cbbfd80b191bd0df82d4/lamewu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46563568822.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/4633066142.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/19397905640.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/karuweg.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bukorulugiri.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/92206407038.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ngnani7mqngbhs3bkcr8pnvmfp/14987534595.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/3107507303.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091123080246489.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_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 17584 bytes
SHA-256: 3652220ca0b392dbfcc42cc4d418e0934740c4d2ae080960d407dc02b49e105a
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 10920 bytes
SHA-256: 33cbf31e604e5e35887bbfc506b3e64d709426d6cb4cfc8facb40c046ba233e4

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