Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6780b570fc17b9f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 14:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d274c1007dc01a20d6c57a0986ac6dc4 SHA-1: 5df342598e0c6f7fbb92d9898b12c359d0c58fb9 SHA-256: e6780b570fc17b9f5f8b1333e1d45d878edd41aff4ac7bcecc9add84b47bfbdd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://associazionemillesogni.it/userfiles/files/pajulemitavisilufapeda.pdf In PDF document text
    • http://gsmontaggi.it/userfiles/files/mejaluso.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///93910175842.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/52776998488.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9b702bd155b2ce7ca8294e0d6716e78a/suwumenetate.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7035e5eaba---10448121749.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3e7893dd---5638100650.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/gikekurusupewajavijon.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/87999740884.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161244ba5896c0---47670268412.pdfIn PDF document text
    • http://synphabase.ch/upload/file/4350806837.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cc2d7b25fb7681eda492e29e3f7f4631/6576764916.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/36379991753.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbfe024ac---wojimagilomuti.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e173d214d8a4808a70b8852612c0adef/xatamaxuzadepatojalile.pdfIn PDF document text
    • https://digireg.org/upload/sidufumimasapakilatedazo.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/6088002073.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7f03ab51---zoremujimejorixakelaf.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84752676631.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/16b4f4983b10f314c17e562e65aee3fe/diwomalisadefunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b7190055---61528121676.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/funol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dixit+memories+cards+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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 18764 bytes
SHA-256: b2377f7cde93cab964a3e0124fe8c7633231876af7c26e34deba5390e541c00b
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10736 bytes
SHA-256: f0b5aefa8e506a7fecf1f475b8f42e10d82a6b8446af3cade53d4d510416398b
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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