Malicious PDF — malware analysis report

Static analysis result for SHA-256 661c125656573a35…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 16:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 423cc184e899b28803b95f8c137bbf99 SHA-1: 4b5fa17d95f335abf3dd211bd8de2f2962931c00 SHA-256: 661c125656573a35a168ea6b414d4d847c517f3bbaa809bbc651dab8463b994e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests a phishing or malware distribution scheme, where users are lured to malicious content through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ezgoe.com/10005001208290177/ckfinder/userfiles/files/11406723822.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e758a0b6---natunidufelufopo.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/20540464953.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608726d6cfc66---rovopefadenirovilat.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/52b902d746771cd73e1efed660ccf213/95371690642.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/75786480803.pdfIn PDF document text
    • http://www.celso.org/download/7646068020.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/31485087946.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160801e3d8659a---pewinadalolapesebi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0pju033stciujbvt0jn4lmchi3/bedagezolowuwekilojifij.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160766e78915a2---90300922935.pdfIn PDF document text
    • http://funperm.ru/content/file/28325389230.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/sopogixema.pdfIn PDF document text
    • http://usmleworkout.com/files/file/7571286379.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a46ae086---naloxokagoro.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jolesatasifiz.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3ooqd0njfrvevfd1iie1vdtp8g/18575878900.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/5379293833.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d444758585---fogejana.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/sobegoxi.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/37462923758.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146efd450e---60209218818.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/79925102323.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/45262142117.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/jusupeguxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bigeminismo+ventricular+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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 18308 bytes
SHA-256: 4c7cb37e3e3ca713344f4cc5bf7c41aa6d48ba3e4383fa1ac7beb3eab7fbc062
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 11184 bytes
SHA-256: 8d13330a7a1807064293f41dbd18761691976d06cbdeb3d4729c2beb1e5ecb5e

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