Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e2ab85e153013b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbd71121a18e7f8651e084a113826494 SHA-1: 84b1f01a856f94a097c7f4cb6849aca410899e36 SHA-256: 68e2ab85e153013be1d6bc8bc0b60f8dd7936844713bff1e6b05bec293e36ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize 'utm_term' parameters, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=full+movie+of+fifty+shades+of+grey+2018 PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1ac555b3---74679505002.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/48175601589.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0e2b937c---89060090544.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87857065211.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613206ee3f541---81755144160.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/butufokakenolibix.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb130fe8c---piresuwuwiruxefo.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/jozupokabu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/64092720575.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/50647130633.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nifuneku.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7878904166.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/junizut.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfebe4e7---liziparajizeniga.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/66249816557.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/53090372269.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/sodidezururowiralavos.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/bowuratuzap.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/111113638.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/16808285881.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/libinufekoxizijax.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/66966647146.pdfIn PDF document text
    • https://viceda.com/userfiles/file/sofinajapusit.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614299b2e0927---26205631073.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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 17052 bytes
SHA-256: f13b2be99520d8eafbb35b1dad0b8671ceb394da842a37cca68645559b50cb86
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 11456 bytes
SHA-256: d65ae5f64b8871a1989f5ec998e7e3492d32fd1c49f99bbf01542ab574cd8954

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