Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde1ff5073cd7dc…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 06:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99566900ef9a0cc440d5ac80cd70490d SHA-1: ae3f9fc317bc7d28f4776f5816ce7f3a1f67dad5 SHA-256: 1fde1ff5073cd7dcdaad2efe7575f25df2524d3c143e436b917b28ddb2e6e09c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://nomylo.ru/uplcv?utm_term=prime+factorization+worksheets+7th+grade+pdf PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/babo9ji5ld66u2irdmbsidvvus/47047775500.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/baruwafofalorobewa.pdfIn PDF document text
    • https://redac.ch/upload/weneluri.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/43489872159.pdfIn PDF document text
    • http://castel.lu/userfiles/files/najudegokejijumufaku.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77371426262.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161137cb1f18cb---76822568536.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ntsdevnskdnp7e236jgokofs7t/79006690057.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/sofazulofivotuzejeroru.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/26854889614.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/37108085193.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8de0f5a3c94466462074e0e145fe3cff/3816819962.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/dolotodutotonomomidozuzug.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5741051da9---69873804382.pdfIn PDF document text
    • http://generaldistco.com/images/file/lotumariwofotepud.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611cf03b0a611---79401181437.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/pajitisizidowanuvavotef.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/setiwiwixazu.pdfIn PDF document text
    • http://df-foundry.net/d/files/rudusugapusixivuxirumo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb3bc1d7b---jelozobonuwigiwewibano.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/dibunatizekuromapax.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/4219638229.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/jafalixizagalidozijoril.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In 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_off0000c3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 11312 bytes
SHA-256: 1db80de8dfc9a8cd949d2f1de9e5622e91254ae814ba38c26757b1f9efe8e8a9
font_02_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 17100 bytes
SHA-256: ddc7f09a720cbfd6874379f5e52b5f61dd4c13458e356024183c7f94b3d7d106

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