Malicious PDF — malware analysis report

Static analysis result for SHA-256 2738848c30024832…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed36ff6d1e8c18d97a306edb300f651b SHA-1: 65e73704be45d3817c5f59865eef6b662df56af9 SHA-256: 2738848c30024832f0f4deb6f08f19eedb603d4780c49fad588c78009bab0f2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to leverage SEO poisoning or similar tactics to drive traffic to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://k-sta.kr/FileData/ckfinder/files/20210901_5D97ADF957109F0D.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/dkltqe0af13iiqu4hchljoha6e/mamem.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b142d0f1ce1---setebatuzazapavakoko.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d9360c1e7488a04592c6d8dc71dd2bd9/fuvonatoduxabemisezodu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ab2krbugcqc3cnhrlb78o9h260/97673411744.pdfIn PDF document text
    • http://51www.org/uploadfile/file/61fdc3073ece47b0e1375c19ad693e31.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/22268372759.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jetudul.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/kazixijazunisuzubufixirus.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607043bbf0aa6---66137585415.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/84675031537.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/84514376449.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f538e876a---95562862677.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/15351847448.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/83780687850.pdfIn PDF document text
    • http://plncse.hu/php_data/file/45417236549.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/94586169988.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/waravewezamevuduwevadu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd4c827341---83737584773.pdfIn PDF document text
    • http://berbun.com/user_img/file/ribusewuniwuneberux.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607828c65640c---18035746960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+pdf+editing+app+ipadPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10316 bytes
SHA-256: 116888ebe1d39d704fb1391b72387f08106405c0633568f10b2caadb757f123c
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16968 bytes
SHA-256: eeca3c476aebcd6edef174998db6f86d13a07d407465fdbc3b414b537f066fd1
font_02_sfnt_off00011b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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