Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5f494e0fb866ea…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 323e9be0b341e00a27f2eceb4e4b0a5e SHA-1: 76246bb00109e86e969145066d5a2046c453de41 SHA-256: aa5f494e0fb866ea5544cf5f5900d3efc82f58380bc693402e95a0d990e6bfe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a link farm on disposable hosting further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • 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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be5052dd9---2225026486.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecc5d0f55bfdaccfda077238c594ce89/nakuwa.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/15016725870.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c1ffad4475d41f3e3c7a6fda4afc33c1/tatuma.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/33940323564.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/33912990979.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/pebevipadaderuxujaf.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-15/20210815211732108797.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c0f99241---67595285783.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/remoz.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/49000592695.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/84ac2038d1074442bee10ecfa2d76e26/1543363910.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/13270999343.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9acdbb9d---85391260921.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1c324bcc3b5b1b039279468f1262b441/59111049747.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/98880275826.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/serapagofofu.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/puwupek.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dupapijotafodoguvukerem.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608417407d4cd---lolome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=circular+economy+mckinsey+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_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 11020 bytes
SHA-256: 67b7eeba2b00ba8a0935772a6ce6fbee30efa2ab1b47eaeccd2da2be1b1c0c85
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 17676 bytes
SHA-256: 6fa54943a80f6b82eb6c76ab52c2082ed5fe06fcc916acb71b63b569cb6b6b21

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