Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b0cb140719450…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba896e6e04858618a774995ee0bc716b SHA-1: 20c289d81e01466a92bc15453a76c085ab34b83b SHA-256: f90b0cb140719450440d905fe76932762e34b8833c6b093fc92dc7ccfbfb4be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm hosted on a compromised WordPress site, and ClamAV detected it as a phishing trojan. The presence of numerous unknown URLs suggests an attempt to redirect the user to malicious or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5358a3f6---78822677495.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/12749354234.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ce9601b96dd9b1eb565c79c31e64202/tixuri.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/56460326812.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210906_5AAF2F3BD4C2956C.pdfIn PDF document text
    • http://hodori247.com/uploads/files/xujifirusimojefidobedusi.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/98889149916.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/vedebemexezororuf.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/birukobotuzapi.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pazuvevadodezadudesasa.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/90618149691.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/47435817013.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/456ae7b58bf45ec573d9af3bd9923816/53762265452.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/7096915302.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/towezatufifugixot.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/sewebezimilajoje.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/dasimaro.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/wumijaruzegatigufesemelil.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/lemovavikizudobotega.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/45052603857.pdfIn PDF document text
    • http://fpole.ru/sadm_files/76141442837.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/93375396495.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1sg6q4dgjgkte7l95b71s0ok53/sefuvedijijawikiganof.pdfIn PDF document text
    • http://budropol.de/Upload/file/kisube.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/mikujut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adobe+reader+pour+android+telechargement+gratuitPDF 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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 16376 bytes
SHA-256: 14eaeeb6842e01351dd656086a9dcf0f0c3ed4a9298436d3652ae580139a132a
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 11012 bytes
SHA-256: b1c924b912c9603a9772a233fabde27f3a923efeb9c9e1d75071e1beb888ad8a
font_02_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1