Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a920d3d47585b2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 10:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a35345dc23e6fdd16c3ed909755eda14 SHA-1: 67ec67414c4bbc8b6ff54dc40afbd08bba4f727e SHA-256: f6a920d3d47585b240bf915eee9009910e6931b179b15a1eca4e3496d15026df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sarljarry.fr/userfiles/file/42986472242.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5417589a0---ditogopu.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/edd2a8ae7f383fa65630203343d30a3d/6720945386.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vebkjugqdqijmlb6nevl0gcf4e/zuzopodog.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/64751312661.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/50155106936.pdfIn PDF document text
    • https://kapefashion.com/files/files/24571925093.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/mapokifafebival.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e9210b358c12330be645492f1e6a61dc/simaporasafikaxurisurule.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aface3aabc7---tufaveregevomixubuwome.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/ropusudivan.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/lorakajuwuros.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608356d6d0910---10386906793.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/mifogobasizevu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ma77jtk0f8758eah0fs4ghjq46/38939700150.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4gtr1lnenieo7igbethihgb3md/75477224830.pdfIn PDF document text
    • https://ismart99.net/upload/files/22055297387.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/86832611110.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/48669937096.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/nelekopeweliritexupij.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/varamiken.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0352eb12---51332378073.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/molelolakuxixananovipiman.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6bcc149---befajelopikutajelowepada.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e016fadc64---17065909293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=handbook+of+attention+deficit+hyperactivity+disorder+pdfPDF link annotation
    • https://medlineplus.gov/attentondificiathyperactivityDisorder.htmlIn 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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11076 bytes
SHA-256: ad7dd8027c11d3d74537388eb04c1195999dfb79ac96599869f37280aeb781f0
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 17620 bytes
SHA-256: 24346b465d6f9c3a445c73af66240ab8d17b98558766c75b61dd5578333e59f7