Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e786bdf40112be…

MALICIOUS

PDF

98.1 KB Created: 2021-07-04 16:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af962ae232214dc1d8b93802b879ad28 SHA-1: 949ac671cfa2a959377f7309e30432108ff38aaa SHA-256: a9e786bdf40112be8795e441c963143dc731d625c0c9b1472544e1aae97da900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://jingluo.net/uploadfiles/files/gurujisojis.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13071ca3d4---73515624865.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716f7396065---mowegazalizatosi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/6241925532.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f3301c0c1d66444800652cc49b8cdf73/90109131300.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81b285bf6---23513117105.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa91f19980---79484204375.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/26334361117.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/69s8rijtlia4h0qscs6h317mp2/37138674356.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5f538f97---20832284439.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/mafofesuderux.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/25122901998.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d8b2763240dcf70660b3c9787fb18b0/pefaritabadobibogemaz.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/sedinubixupalowezu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kelebikumebasujet.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b64c11ce---51005629741.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15d8097df---gurar.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7445f820f2a40fb97d100afde27a7a49/leguwitamoxudipoku.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/pilepakamir.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/64258954373.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/80944138421.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/iu9bcqquiltdbe9avv53vc5559/rebegi.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/97527410067.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/mepeluv.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/de86dbdd20a19206b4036edcc8c33518/10402486326.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l4l1bvp9lq04spauhdag1jgk1c/gubupejotig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=law+on+breaks+at+work+8+hour+shiftPDF 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_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 17524 bytes
SHA-256: a47f190b439d4b247516795143463b90f8dc6c000f78a1b1339c6c74f91430c8
font_02_sfnt_off00016010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16010 10848 bytes
SHA-256: 8206752517189807dd398d8c0b6b93b838eb45d14196aeff66d1ccc1326a49f3