Malicious PDF — malware analysis report

Static analysis result for SHA-256 888ad53cdb27dc05…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 22:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 871d9fd0c6a1516ec90aed823fdb83d6 SHA-1: 4b90babb219ad3070663d4b756036c657ed63419 SHA-256: 888ad53cdb27dc05026087f6aa41a581ce509900708d7881247777ec51f83280
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=android+11+for+s10+lite PDF link annotation
    • http://mosme.org/uploadfile/files/lozolepakusip.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/valorosipamedemeladufa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3havvs871tbqaj4ajr0fkj98ic/fiposabavojaxetefar.pdfIn PDF document text
    • https://kawanmto.net/contents/files/26307107591.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02380b36a---jopodiwanoravifedojisiv.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/mupinozolitakeze.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/53892555644.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/vonedevubotipor.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23123060753.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091015133073499.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131464c80968---61562747981.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/54631916630.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140caa45707d---35847728599.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/tovabonoza.pdfIn PDF document text
    • http://wohingltd.com/userfiles/6741499496.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383d453d618---76680197139.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210905133500.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/gigivutikibovowiz.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/27001922810.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/5800394895.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910322406087.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/uhhg26a11hi2cs2o12f2golcgg/89131064791.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/66599791815.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vanexejigamed.pdfIn 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 10340 bytes
SHA-256: b4c7fef85987be7ec0393d7c261106c4dc9856e3d993f56e447cbb0ef9a57828
font_01_sfnt_off0000cac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC1 16540 bytes
SHA-256: 761ea73be640784336b5d3b5459a67b8ee66dabfffdb67f0556a583db5a9abd3
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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