Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64f4e3412fcbedd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 00:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7c92f542c23ba8549a3a1d3c4b0ebac SHA-1: cb0afa67f45cbb76835e1fab14b066a031e3aa83 SHA-256: c64f4e3412fcbedd31c57e9c479bd16799616f2855be14483d84040177a68c9c
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://svsteinfurth.de/radsportfiles/file/31996373303.pdf In PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/pukonagisisuz.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3197016f4---navejizojusipemov.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/834e4dad1af51a48cc578ea3b78e3c3f/vafigaratuxofaxij.pdfIn PDF document text
    • http://vswet.ru/f/62108488402.pdfIn PDF document text
    • https://kueapem.com/contents//files/50895241460.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f2817290b00b1d68ba7949ec8fb4ae85/boligujevedizudasigoru.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23041759b3---kalaluvopebo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/xuwukememutajures.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36cc540a---vedolutiwiduzepinin.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2668be31---tabasotozunexov.pdfIn PDF document text
    • http://rayanchem.com/d/files/62568731550.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/joxamaselomaxezokabuluk.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/silowemubaxageser.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/93879332096.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/17280921035.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/30130030d6699f0b29c2b74d5962fec8/vuvuzozukavevipodukoge.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/749dd37edde80f694504aaf7176e5440/55831705992.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89759bbfb---17937552854.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/m7n0tju3a39g4ol7l0cvb6mkih/91552541583.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/nefiwimekafo.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/46511295319.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/341d57bf165e91d0f02fe8e94b3443cd/25154877022.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b0cdc56ea8539b4e59075d57489db1f8/kizezowomokel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=call+me+by+your+name+full+book+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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 10776 bytes
SHA-256: b4cb398a21ce591daae48d6913f2a49cc70cd2d0f53c99ded83f921cbdaadfd2
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 17616 bytes
SHA-256: 8409892bd6210097ccf7f33d6fded33b86df726cbf471704eba3c58feb1d28ed

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