Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3f7e05305ec8ec…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 02:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de83ac15acb40fa89550dac75a46ebf9 SHA-1: 20a0f44d108d2169b3f76f657075f7ef95a534fd SHA-256: be3f7e05305ec8ec0827a5cfb31eaf3cb5ea0a644eeb2ceea841e9c1a725b449
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ujlaggk83smkrgrve0grb8up4/90811004732.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a0f8a28add48028495d338fd401aaac9/24959220612.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/pagikudadogiluxaxam.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tkf822dn0tvvcc1kmnh0inkb45/51289374920.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/44934958873.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/70682863013.pdfIn PDF document text
    • https://anjingliar.com/contents//files/85053898995.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/rasusid.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/70774516009.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/21946971016.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/vubajugoseboraxuxolekofe.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gbn9q68hrtliebc612s13o3p48/60465688477.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e30014ec41705d491e4f166e1dc34b56/74075594398.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8f8bf4f8bd8e25ad34863cce6923312b/41972811969.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/vajewelubamavojofured.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/47484670642.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tifekesijoxamizuzarabiti.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a8b53a37---35416800996.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b172e3d31d9---koboladumisunizesado.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084307cb25d8---44547788438.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/72245429611.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/30254598418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=catabolismo+de+la+glucosa+pdfPDF 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_off0000bc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 17468 bytes
SHA-256: 6d7471ec4815b475aa5384413091f236878343727dd3ff81721533c61bde2b93
font_01_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 11032 bytes
SHA-256: 28ce76d61004c073c1f5916ab846ccf5815e2ab1a61c106c2ead8eb04fff9794

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