Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88c871f1f5cf814…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 22:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8be9ea817c76149094c51cfa7132b6f SHA-1: b199f2f8c2dbe434c485e92b938dbbc9d3ace2f1 SHA-256: f88c871f1f5cf814a08c1de101c0cf77335ac343d4b77e0932a072a56d644c02
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://innospectrum.eu/hirlevel/file/kakisifuxabizirasawapepap.pdf In PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sejebexatakogomumevapa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0251cb71e---subemaralisekipikojivuk.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/76792139573.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sfmvoe17vg6tnbt131t7d0b8r5/kosamefumilisavuraboreros.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/burevugunavukezogijijuz.pdfIn PDF document text
    • http://evola.it/userfiles/files/zaropotopaba.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7feafd93---5931689961.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/70c5b9d3104da77df6032c9aa218a1ff/vupudikazurojede.pdfIn PDF document text
    • http://orthopediedelft.eu/files/xodek.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/mukivimuleke.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60905155022.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b478a20b10---6590980992.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/31928346975.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8eo0b5imt79iid08kbmiua0ccc/ropijanujivekepubet.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/sowelenifixepiwunu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kogafinixubusub.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xokikarefepexudi.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210619224134775435a6g1ds.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d2c2c545dbb873d376ee67b9c93e9cae/30482764246.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/96826874598.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/35094799855.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gedowebiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=msp430+projects+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10704 bytes
SHA-256: 7334088cffa096e2c43fe6d041f4fbcecaff2b632a36851ff76ab3f30836e024
font_02_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 18824 bytes
SHA-256: d755a1a27fb4e3902367bff2cdc97b248ce213a44460342a8a51bf6c118a872f

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