Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73cf2fa07f3c16b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f94853df02b8f8023b88ba97bd8c447 SHA-1: a29014bbfd8199ffa3d5dff1a558a6239b3e6741 SHA-256: f73cf2fa07f3c16bc6eca11ad7f005cc7ead5ce49c823c7538cc317155c37378
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple URLs hosted on potentially compromised CMS uploads further supports this. No scripts were extracted, but the document structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://smidgel.ru/uplcv?utm_term=speaking+expressions+cae+pdf PDF link annotation
    • https://riondene.ch/img/uploads/file/22758505306.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b700ebb5---sopofasujegexoxem.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c69cae194d29e91cd8c08bdc1635a300/2228734645.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/caaadf6aa98857ec9275a8f887e7c5ee/jenirike.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/93aa35d068c4b967e25cc546bacf0ee7/vapodajeleki.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/xopasizuvex.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/29409647812.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/92564749777.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxisizi.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/99341709907.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/66266347600.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/xulodigub.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/fuzimozedepajekalaxomeb.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708a1703d36---nefavamuxabi.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/39512558896.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/refewikosafiritifawaroze.pdfIn PDF document text
    • https://termofriz.rs/files/45127767408.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/sewanik.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611498a331cd8---82843177435.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2d0e400950e66a1b2fad8945f165ee1c/tebin.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/89078486156.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/aldjl597e3vhg1ah8rgvpqavc4/jugurajawas.pdfIn PDF document text
    • 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_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 18644 bytes
SHA-256: e254094a119445395c4d69ea0090e94d4e91f8a1fceb18511dcccf9bf0c7ee1d
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10920 bytes
SHA-256: 879dafb72c735526f98fcccc1a4326b5c94de12f24205d2009883dcbabb5245c
font_02_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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