Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73939572dc9fc3d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 01:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d2369acbe90f36558bdd8a4afa5534c SHA-1: cbe59471a758009072143e52472c9b5fc8e3b785 SHA-256: b73939572dc9fc3d536049ca2e3868cd4c4874a907bd548a17329beb244ac3a1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cargotavio.ru/files/file/tugiwi.pdf In PDF document text
    • http://arcos-eff.it/userfiles/files/79843782153.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/mupipomidoxem.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/52810419063.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e9468a34---rimavexa.pdfIn PDF document text
    • http://emannsltd.com/userfiles/75897758518.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210605_A5F6F148C4E4A0C9.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dp68o4e05r7cv91s2rno3vaamh/giwewajizonusinux.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c920f09d342---zibuvakoxexiku.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210518034352.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/eae481733215e571c234c16ac4c2f121/28007650293.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/50861521287.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aa633646bec67722ed8e3b71f51cf206/fojiko.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/31488394751.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/xapubawifunedat.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/85099095172.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/wodejavirako.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b59b746907d69ab3610a71a8952373b/42169532149.pdfIn PDF document text
    • https://luminex.pl/upload/file/gagoverilogozikupis.pdfIn PDF document text
    • http://msiutilities.biz/documents/48859876756.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/49434936211.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083496aae650---zatosuzorafokage.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2e6bd1dd---13709104597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=resume+format+for+computer+science+engineering+students+for+internshipPDF 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_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 11164 bytes
SHA-256: 4a1502017073788c92ae08339647049d7ad4163a57dbbe754094006ce6b097dc
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 18936 bytes
SHA-256: 1c7a45933ca2d8d66d024d217ee23212f2f89efb9e36810f475e7fdcfed73207

Open this report in the interactive analyzer, or submit your own file for analysis.