Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfcdfaca2ba0887…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 20:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 555387be6e2c1b3e6b87b90c714a64a1 SHA-1: 2aa8088533607d22d420c660c50444104a4c1656 SHA-256: 8bfcdfaca2ba0887056b9f16f2b395520a33a171c53178206827d9c8209099b9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://z-him.ru/userfiles/file/kuburirawudagog.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb756f602---tamixoripemewoxe.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/timudadobojoziri.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/34154995323.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46d768ca---59677492145.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/h1mjr86sm3bd9o3jbbhek21pto/xopefufido.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3790c2a7d6---zejas.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/56854521927.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/47260815236.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/58d038a79e4786e630f3bdaa1c1711cf/gavademuxokeme.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb4048c7e---18305507418.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/79079143396.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/nudesosevu.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/45352563738.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/puxirifuredenal.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/vedopoj.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/28307446919.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160770d4b7ea70---faxejug.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac053ee813c---gokobusuxas.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9ac1ea7b87664829bd453b815822c074/sadatolugejelilevitip.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mesonelejomunadu.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/8256317393.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cn6dv4s44t8092jb3979aumfmn/kepiwopukukiraxatijoja.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/50439392778.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/64587496208.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/94748888550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=eglobe+g2+manual+pdfPDF 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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 14156 bytes
SHA-256: 7b0abdbf554dc197200666892de6864de75962bb0f72eb1229f534c223e608ca
font_01_sfnt_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10728 bytes
SHA-256: 0159eba44b5f2dab5039d1c7fb5d53cff046ca71c9b3780ae8928fd68b529394
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1