Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efa48e6fa2f4987…

MALICIOUS

PDF

99.3 KB Created: 2021-06-30 10:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e1eb488d3fd30bc4dddf33ec7b330f9b SHA-1: bcd5eddaf235a8e2b00174373a311a1ffe0e6ecb SHA-256: 1efa48e6fa2f498738d73b4cc95fbad0e49a263569a1d8ef7221d601db3bedb2
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=watch+black+panther+full+movie+free+online PDF link annotation
    • http://simonide.org/userfiles/file/xiradokunutenimawobe.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/68938360209.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/lulorugamaf.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ba393820ce312e6d8e7e91958b7e719/gubevetemaxowuke.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/40367956147.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e14b2f841---radifalozo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e9e32a2491b8b2e0315f0e258c38d60/54272448002.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f478ea9f9f004344f83f3ae866ad5497/57825476804.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6465ecb55---75623080490.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d67b6393---xofexujuzu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ecb5a953---zidaxufobamegonuxot.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0eb40fcc7---lexututos.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210621_100746.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9298a9e16d227fb128b9da340f61a2a0/9474323012.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84b5395432eabc4a47c65f9dc6eebb77/66885100614.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9a41f1b0---duxebumikelavivijinebu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vsiki4ajbaf4r3gf4lkc2gn9lv/63942381259.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/38567183816.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed06e506d---82984111265.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/54855478409.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7051f79c---89385681900.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070397dda874---xipife.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3330daf4---49893670501.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10968 bytes
SHA-256: 5b66fbfafe852b968471c0a3562c6a85b4fd312d8f325383a7de516618c2bd6a
font_01_sfnt_off00011364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 16772 bytes
SHA-256: ff824953177c9bff15fdde8644240e8fd6d08ecb8c6553a9a8843935fe3e8d24
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 19532 bytes
SHA-256: f0c5518c48406257c19192ff865b6685c68d78884ceac284e09ee6be771d378b
font_04_sfnt_off00017511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17511 2128 bytes
SHA-256: e3ce8573f38ee457a1bfffa8972e3754e5c8ee645622e6757591bfb0b2937e80

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