Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fccc54353087a2c…

MALICIOUS

PDF

81.4 KB Created: 2021-08-09 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48a05f9987bf604bdef0547ac3b417ac SHA-1: 09513bec42cdc11af95c89d3635a2cfd887cd7e8 SHA-256: 7fccc54353087a2cdd5f43a79a9c2414eb418a8112d548093fbd8e6a4dff56de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links align with common tactics for delivering malicious content via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=taller+de+%C3%A9tica+y+valores+grado+10+pdf PDF link annotation
    • https://alakharia.com/public_html/userfiles/file/jusak.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104290755125629.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a213aef9---55224576734.pdfIn PDF document text
    • https://maria-galland.ru/files/file/40686115003.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d759c238c4a5e04705b1f7533c1f426e/71058736335.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d769262faa2798378442d1dc298968e7/demafabunepafa.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47277194687.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5879a4e65f94eacb7dd1191ccc80ed57/75678260605.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607340a190cff---megupugogavejirul.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/85452464580.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f39ea0d0729e0511eb894764db337b22/8626698557.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e38f1c3b9---mibogavapifebuguzot.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/44e970db692332fb6c210f0804fd9661/31088466136.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62014856954.pdfIn PDF document text
    • http://simoncaulkin.com/images/27512053327.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd6d9fddb---sizapuvabisi.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/nevavunogasoje.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/46627494522.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/59472178379.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zavajonixuzabima.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/dovem.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/54560932985.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f8f0u5hcv64b0so2osbg3lljr3/raxusixixu.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/11387538540.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080308464365.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gezuri.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 11160 bytes
SHA-256: 39fd33179c5b0fe6de638f8e314401fc4f67a7a42dd265db5afaa9021e76d115
font_02_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 17592 bytes
SHA-256: e2910bef84c00c09ab12f607b3f6cb919d489791c27d6f55b6903e1a8481d84c

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