Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d3e27a05f625d2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75618ebb2cfb9e4284804ec07e7eb17f SHA-1: 884a602e36e6aeba0ae4ef24c2b6de0a6d2188c1 SHA-256: 96d3e27a05f625d23cc938598494d5bb44e94d61c57dedc4c38a0f8c6c08d9fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=sinhala+cover+songs+mp4+download PDF link annotation
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/sinazonogon.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/48273255909.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/wagepelulexakeratuvazorat.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/9677448142.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tenamezesujimez.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89280267875.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371beaf14a6---xanogopuxodofitazij.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/velugofozusug.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/rotudodo.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/66328733533.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/91171568003.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/25315155982.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/weken.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/lolerazadig.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/58f98393aa4d6e9bfcc7b4ea5475104f/vulezunegobemoti.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/30751719004.pdfIn PDF document text
    • https://peterdegendt.be/file/65530577211.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/11894727768.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/10352648970.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/doguxa.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/saregaki.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/pemikus.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/60403776948.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a73bf8cb---13968221582.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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 11168 bytes
SHA-256: ed534e7c8d95911087c814babd7530a457e97211b0188896a83f9321a0ce02b4
font_02_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 17604 bytes
SHA-256: e888bcda9cb5a98d2d475394698f4cf0b3475d1967d8ca69f2205e904c5acd6d

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