Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa5c251648017b8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 05:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f67839f5e5c28e77560d9fca6fb96a49 SHA-1: f93b9fb90a83fd85dd2c7c16cc6cc247e2f525fb SHA-256: cfa5c251648017b8b4a9d8320fecd7f46048a12dea14ec651df8da76d94aa11d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, directing users to various compromised websites and disposable hosting domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to distribute malicious content or phish users through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r9evop7ejve1v4h4j5se83cu1t/77582206638.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160781f3adc5a3---70846771961.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759246ecd2c---22451040854.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/furokapebis.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/dejivukexakobugilako.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/miwazodupaxu.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/sefojalamani.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/41295401439.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/88505541643.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1cb29cf0e---sanujozelok.pdfIn PDF document text
    • http://devison-matras.com/upload/file/pumatixedeperanorinefeki.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bqsklovvprsp3shjudef7qae45/zegosotogelufupog.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/82963eebadcddce0f7dd40da09cc63a8/paviwosavedipufu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/74082370129.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/samezezujuweripazavorakis.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/kamadodopukonud.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/9227907487.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/jerapasok.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/13182066555.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/lotewamamujo.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/remotipasaselemaze.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/2743867794.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/82014354534.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/bokatameberowonu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb7881i5dotie784b7hdsset4k/9632853887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=envious+meaning+in+arabicPDF 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_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 20676 bytes
SHA-256: b23e51c85dbc30cb39d5da367ece552a0c3bb5acf7e04bb389abaaf31e2e3c3a
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10720 bytes
SHA-256: f143fbe2b972668627c4abe5ce042492e43a4abd36d136b5f5c1e9b8686e84df