Malicious PDF — malware analysis report

Static analysis result for SHA-256 c128ffc11fbb2cd7…

MALICIOUS

PDF

91.0 KB Created: 2021-06-26 05:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 982f5d3fd41991cac96723cbf0ff8cc5 SHA-1: 5d5a96e2ad9c41acbfa7d7b67f1b97c89240b525 SHA-256: c128ffc11fbb2cd70255fc087c183367f3e16308abd2630fe4c0ab19787899b9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are the primary indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://babamore.com/upload/ckfinder_temp/files/20210616094148.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/67729067948.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819f41eff8---minutepijidotozefalu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/simito.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc45b86c8f---jofikawomezaxi.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/11aeed68861faedf0cbf00b83eed3326/lubuvonavabukeziburamofa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8056d548d---pevobuvobokonu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdff5be0fd---zaguzotunesixosanipawebuz.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ae07899c1f0d967c54b5a2f7bb6dc80b/18453501826.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160877e64ad28b---18269406143.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/41834681131.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8b7b1ed7c4098046719aafcff6e56611/41494651977.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rukibutisisuxonujitetumib.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a948088aa---56505489119.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/61472690985.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/h2vubdh9h38vgu5vkaa16pdnai/tefozodenubojugax.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160888f5927d97---64623461378.pdfIn PDF document text
    • http://alkanboya.com/files/file///pumuliturijovedig.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d923db849---xonivepaw.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1nuqjfileau1jt5rss30p8a6e/zamutebu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b915bbdb769---55440500860.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608269e7c9635---moferajeridor.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff97efaf6---59347320487.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608051f595570---vusadazoxowux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=claudia+chi+gynae+reviewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 17060 bytes
SHA-256: c44fe2a720ab28d2f17c5d9a42b78e804480a7fe4a55d34759e16a94587251f3
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 10660 bytes
SHA-256: 0057a0fc0bef95780ac8d8621a2610de3621416fd07f8c3a629459f5f0fda375
font_03_sfnt_off00014995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14995 5788 bytes
SHA-256: 8c9be292a98a58f11a6560a6e97208fc543b1db5e16a6907186753b11d26a2ed

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