Malicious PDF — malware analysis report

Static analysis result for SHA-256 48924659eb9bc0c1…

MALICIOUS

PDF

91.8 KB Created: 2021-07-03 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 328b53e9dd6e915481d0c53977be4576 SHA-1: c4269a0cdbccf65b496e41ff5b4908569bb51fe3 SHA-256: 48924659eb9bc0c196be44b6596aef0e5c7ef949b7d6ce7965b8cb91b76dbad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised WordPress sites suggests this PDF is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://cissud.eu/uploads/ck_editor/files/10464950887.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/26d4d90eccee33b7c1df7255f547b257/ruvijutixug.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0bb52786---3943835136.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2161c52855e85ba2f4e4ef93d1f2a77e/zivisepitixaf.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5cf1fd8d82c57dc2738d17f1d71ab351/77042677186.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166f07add6---zetolezinak.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/324956893.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q229jeeu6954jcr1o6eduucv44/xojegikefaxuj.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/s59340tumobg47pi5bm7tem2b8/vodepexod.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/8972921333.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f4c4b8e9aca055d282b4524a8275910d/29304321311.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ff44c07b72ab4f63888c428b6d2eed16/duvalukawofobinesuzoz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/248684e028aa054b07db547f2872c29a/3662180390.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/raxanavibuto.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/bemeguxolemati.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/ligeposawewipibobej.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ee2260ea430dd997146ea8389ce8132d/bopubozerurasaku.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077018ed78a8---setakebovov.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/52398579e3f1d57017b19e8dff2b80e0/xufudefabemis.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/15395847388.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/66906669104.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/bidujenakut.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a47e488b8aae046fd5425853186d75c6/15992604388.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/dexodugeboduluzawubu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b73930154fe---68723448943.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/21250990868.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/48218687539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=easy+at+home+yoga+for+beginnersPDF 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_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 17088 bytes
SHA-256: ce185ea862ecddc77dd1adc3b87527fa9df5c2fec4f8962bd8c5c70366be6000
font_01_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001472c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472C 10852 bytes
SHA-256: d83d197e034dcb67391af79f2491f0e072558b819f4f5ebc9e87f2ce5efdfd03