Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c245e37a57d41…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3909331be01eedb6593e16952ea29b55 SHA-1: d10ad63bad54132f01835fc88185171241b9215b SHA-256: 552c245e37a57d41097571f5f2efd4204e64f7b3fd5c98fc564cd93a5c42feed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://dchs1961.com/clients/871949/File/lujovebojopi.pdf In PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/taxaxotivuzafopizile.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/28075523702.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5a3046a20977d4a182e4c8456e3904a/32385572898.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/78440996666.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/merun.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jiwuzezigebu.pdfIn PDF document text
    • http://186086.com/upload/files/kizojasedivizomararipu.pdfIn PDF document text
    • http://orderkai.com/uploads/files/lososerewowutawetubofu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/089a78d0a0d242ce1bd681a518dd1703/migebibamafube.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100d3f093330---guvepopemored.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/voresulebenaxowaw.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ccbfeffc251aecad68b303b22e4fefc7/bifujalokorevevitilapa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b2552a9d---97608691449.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/82045512219.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/7205674589.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/9330113239.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3d593b42082bf41ba58e3c78814cc7a5/sifixiwepimududovesuji.pdfIn PDF document text
    • https://drsaman.com/files/zalopedesilubefuso.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/ddcabf412906dcb6c14f63dda23c1e35/lutexudifuw.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nutokadafazag.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/vukebojabiberu.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/56197814363.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/vibege.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/88186769514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=telugu+calendar+november+2019+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 2352 bytes
SHA-256: d8f12b9d2576a27fdc15aa70729a655fb37895fb20f18e6354b1dfdbb1d40221
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 19832 bytes
SHA-256: bace79366020c2545b3c5eeb51d65afdaa1c91079cb56f9d434aaff9dfb759f6
font_03_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 11336 bytes
SHA-256: 41e803dfa8e6b90939a6d46827013cec7bdafbb9bd1327f982ead48d77f06670

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