Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1fa2b78219d45…

MALICIOUS

PDF

88.6 KB Created: 2021-09-04 16:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbceaa2169bc466993b1771b456dbf7c SHA-1: 83b9b1b33250acfbe6a6719f6ab56f8cdf6d886e SHA-256: 88f1fa2b78219d459408424b83e9e5f5010855f8ca54aba4af4b8a443f1c1667
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though obfuscated, indicates potential for further malicious actions like downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://bezpiecznamlodosc.org/files/file/fonutasebozes.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d916e391---pifijekediwo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/sogurofarid.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/buwimokotepalog.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/7517872025.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac45ad64d---51533877733.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be87d7583---11689033894.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/vofegojipijolo.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/4556365472.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/tobusurevelazivured.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83998642786.pdfIn PDF document text
    • http://tele-video.ru/upload/files/85993570913.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e990f3f232fcc5c8e04f24f8ef78a7b1/82117223427.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/73517513757.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b62ef6a1e6e---lunuv.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/dd63510977c5fcaf36193a3f2f34b3d2/50914865304.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/76803118175.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/pulimibujil.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4f36c5bc00c4bea0411adb0ff81b0f80/55959696836.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/59182966629.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3a5df77ab4b41c126ffce10ab9f0ca2d/22512725891.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/fekemedovozexojuvonokiki.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tarupuregodupakutopap.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505123100163897.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/noderesevilipadipinise.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aaff6b0725fdf62a674170918fa83253/pufujodukuriluki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fiche+de+revision+bac+es+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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 21208 bytes
SHA-256: 7d038afa0d1ddd1a4753e7150ecfad9720acfef0c553465134b9d21ebf121177
font_01_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10756 bytes
SHA-256: 0df67c9d1d1265d908c99c8075f28a1ae17ce99332724e08d08c0c24703c1ef3
font_02_sfnt_off00013ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.