Malicious PDF — malware analysis report

Static analysis result for SHA-256 f492685fa2df778b…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 18:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7140eea7bde5148a25c76aae9aca2611 SHA-1: f2d2d482d81dda7ae3c4176ce55d83ad657d61f3 SHA-256: f492685fa2df778bc9f8d790555fb44044eaa2e9a3ea7cca3b264e020d7af750
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=wset+level+3+book+pdf+free+download PDF link annotation
    • http://targhevaticane.it/userfiles/files/zawavajupowoken.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/55578052231.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fb1d9bf5a---93869662404.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/70612061624.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1orjmjiok961c1bdjf3onmpi8s/nizuxozibup.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/zexujewamexebufekin.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/99810357328.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780a8bcc300---97207428846.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/28917552277.pdfIn PDF document text
    • http://ccshecea.org/upload/files/rafaxaguwebonus.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7644687533---gepesogogopirajotuno.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a0bdeb8f---nunekixagedagetimi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b34ee699---82274866999.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/59210133049.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfade3040b8---bonezowanarotenotaga.pdfIn PDF document text
    • https://parc-hotel.info/file/75348883228.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/4470633888.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/98304200939.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a2238af6e0a047a02b48bf1c0e1a4eb7/92652374537.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/33700121316.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tr7avobh8si70e5kfdar0kn9vr/xaresudumowuj.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/bifelexuviluxupuvogoremep.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/tenasipisewolo.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/85a0or8l8lup5cllbp2bcma815/98988943225.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b475afa7ed2f7e2b59b47d5c1569017/xutugu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ea4e650d---gudeganujaxujalopazetano.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/38641412701.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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 10948 bytes
SHA-256: f7793d33b5ede5fcd34f4ea25cc43203cbe1b0c085ebcb73b8c0f90af3b4368e
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 18392 bytes
SHA-256: 8f5ef471af6e530d4438d1c6fa7498ca39cd241618ae137b0f33083c01256251

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