Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc812f50097b22…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 22:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8558ac627ac0a226fa4da80bad31c64b SHA-1: 8fad092d003742637beef30250bb9e74839a8dbe SHA-256: 37fc812f50097b225f992fa47871be0263b2a5affd73a9c5f3c77822f8d80dc1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs that direct users to various websites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to external sites through a deceptive document, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://warungmimpishio2.com/contents//files/25082701587.pdf In PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/81253028133.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ebc3651c83ba513917067790e971afa7/pumukezeleruxuxu.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/53185715125.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/fujefomulalipefu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/57004475448.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/34749429096.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963d212a8d9---kuxurejupawokija.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc146333c7b767d74ba2cbacc99cab46/44909872481.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd96716002---vipezapijaxegiro.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/90601c0791ebc038d270b00dd166aeee/wazisosexirijovujo.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/kelosiviv.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/89955657204.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/71020785062.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/17310347374.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/rogaleliduf.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/defuvimajitejowu.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/suzevenaz.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/79674442848.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xafedefelapexavajizo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c6eab40b---10761074589.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/suwabobexudobowezisukid.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2fbdb568---koworimepupiliwafidojef.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607757404a5d7---zofagaxomofupifekavifodel.pdfIn PDF document text
    • http://korytnica.net/data/files/nofedowole.pdfIn PDF document text
    • http://usagimatur.com/files/others/9677462200.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb26f73ee8f---95770980671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=antiochus+the+4thPDF 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_off0000c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 10176 bytes
SHA-256: 8d6c311fb46b6194af99da9beadcfbf06e1a2b859ebfcac16f6a4f6b3bdbe396
font_01_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 16368 bytes
SHA-256: b6bdb858728c13e98ba2d185ae9171adf4dc85c773a87f200aa51a112ce59150
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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