Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74640caf861c9ae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 00:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47478e5bd894462179b90de472fd5320 SHA-1: 038b2cde7d010a35757b60be3c12e91879119890 SHA-256: a74640caf861c9ae2bc27adf51335072733c5c06cda0297675823cea5405a80c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sten.kr/club/data/userfiles/file/20210827144745.pdf In PDF document text
    • http://exmar.it/foto_fck/file/332559318.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/fipapaziwalulujukawife.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a0aou52o86hnogs5ncn1fkhbl7/tafosaxununezavinuluzofu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c4c3e3de13a7361b1e7d0ce92049a050/51146297819.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/jekebiwovom.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/tenenob.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/5520973306.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/mifakasofupozix.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/87454728872.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/06fa586b232fbf49afb62221a020bde8/16955015621.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fagonulowapebupusin.pdfIn PDF document text
    • https://bioesteticaonline.it/file/35155439020.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/sapakivaxiruxuwexufevi.pdfIn PDF document text
    • http://grabnerestriche.at/21797752611.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/94494830076.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a66467802aa---65821654591.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/pisimasuginudujisu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/53f0e9c287a6394513a20215da291452/5924995326.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/17996770896.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/54924622975.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/18323978095.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de765dc2966---tililowa.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/pibodupowoduj.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/52276102973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=right+pleuritic+chest+painPDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 10680 bytes
SHA-256: 387248a337e1c3ce84a5eee4bd03b9942b0d090e61d7e3979cf776183897e732
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16100 bytes
SHA-256: dc7a56bcda526bd78231165b2e12d2c970fb72ae9ea2a76e0be0fbab538d5504
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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