Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e9d3c285cb5bd3…

MALICIOUS

PDF

128.9 KB Created: 2021-08-29 05:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f462b7d23d54956070fde0304e4c4e8b SHA-1: 631cb666bf3122dfb6c2413d2530885f41a733f5 SHA-256: f5e9d3c285cb5bd3e288d56add22244927fbdac4a99d50006a73f03f7dee8f0a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classification and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded links point towards an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.predia.cz/userfiles/file/siwozewagozonosibep.pdf In PDF document text
    • http://beateromer.com/bilder/file/lakujamenodu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8a3c14a1---lixakalugelemodokewin.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/pikitadi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f3343df24f302bdaabeddf0e3ab4e8d1/71122728033.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/21024034759.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac799661ffe---42153124617.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/84671009730.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/52107248982.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/23611080861.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a7ae0eb7b---kipusoraxajafuxobel.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/19397085788.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ddd512e8---renijezudusarugoxi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5fdec0c3239ec0e2a4f8382c9a0e78f5/losusematu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f24e390aba5b82116562102445f108fe/7057282.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/15960795138.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/lirepubiziguvawumoxawi.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/52502785090.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e82aefe34---wekonizipemojogo.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/litisuwiboj.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/60632306876.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/22917821439.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/ledadudevedez.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5cc214e9---wipeveritapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=transgenic+food+crop+for+night+blindnessPDF 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_off00018e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E99 20216 bytes
SHA-256: b46df1ab1ea184bc148c36c886eaf6288075eda0e97725a7f49196e032728e05
font_01_sfnt_off0001c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C443 11000 bytes
SHA-256: dee85bc96d8051fde6eee9506835e98169e5c98b102fd70a94cc788336bf919c
font_02_sfnt_off0001dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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