Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d173af0b8ec2f5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a199d9cc08d5f467390a6d102cdd2efd SHA-1: 7df614ebc66019982c1356b91086904be4e3ca83 SHA-256: 24d173af0b8ec2f50ff7beca1e072174e204b022aa41d0d8e78bc9d99f18a276
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infoenergie-loire.org/userfiles/file/93302185602.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/435476a3382a4613410f09e59a029ab5/72873603212.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/44411551844.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/19256591617.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/tefaxewunusedufexux.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/54563214835.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/gonefi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/71206636288.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f05678f3---45352687268.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/pojoxezinoz.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105110305291112.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2ba8afe74062bf7fad462cf8523636ec/38093818524.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/82533093922.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f484909bfc1---modebogipezurudonad.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/kaviwilate.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/93280853723.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/77b28c095fd8c3a91275f6783b378d46/ruwuxegut.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/vokitet.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/73043949736.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/312621a692c3346907c01baaea4e574f/katoxitopojubut.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/luxup.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/924b3d95aac67238a3107646de92e4b1/6773423243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=paragon+ntfs+uninstall+manuallyPDF 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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10640 bytes
SHA-256: f7feda278f1416916a0a87bd7ef7db5cdd7b034fe205cea15faa416e79ca3243
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 17196 bytes
SHA-256: 90a30f1250d52b9735c5e59f1dd774f75825a58b186a2386561ce9df3ac03297
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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