Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca23a32945509e2c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 20:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97bb875115565491975c0a2ade470d76 SHA-1: dea730c601a0434ed0877ce4346f0c7d62e3ea53 SHA-256: ca23a32945509e2cc364334d8844558fdec4fd259386e6763c5c8926cbc6fa4a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a link farm pointing to numerous disposable domains, a common tactic for phishing and malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hoanghaie.com/Images_upload/files/jatuve.pdf In PDF document text
    • http://odpadykj.cz/UserFiles/File/sugutejozaziku.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/25306713717.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fawigajimedujilepi.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/76436576378.pdfIn PDF document text
    • https://netpage.info/userfiles/file/dawijitebotajeba.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/bafokisilejagonamufus.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/todelatavokibige.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/mowakulu.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/lobuborevokamilafazori.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/lifoxulitajigaw.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0f0a4ed4f4d6ef9575366df7bea31ac2/kuvozoxewitepomiwipom.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/78f08136420eea0f504cc44270ab8792/32854473438.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/clb9qvc99u7f9868m48ngdr8hr/vojalapumatefulerasadex.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/27010860037.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d609b785c89agtfgncvrbk3qu3/28510296372.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/pujasaforixogetomote.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/67622637439.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/pofuwisemomep.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/5440998916.pdfIn PDF document text
    • http://budropol.de/Upload/file/mupadijutuxanoziwobi.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210914132409.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/80266908824.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/pekavuzivikafim.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doboxagozalerunexibize.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/18522094810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+copy+from+android+to+pcPDF 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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 18100 bytes
SHA-256: 8c058df830d85e1986660448da4b8d5ed3be50d5b9180376306260895a9335f0
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 10628 bytes
SHA-256: 7531057b9686cd37c6b9c5e7e76f041fded98dbf6c393109668a8db085b1f5ec

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