Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4ece4c9726eece…

MALICIOUS

PDF

98.0 KB Created: 2021-07-23 00:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0da29dd3367a3624dcae8710e393a62 SHA-1: 29bae8591370d1912e9fa91e06ae5365fb6e7497 SHA-256: 8f4ece4c9726eece5874a8e728e52926914710c1fe5c1093ee40cd6358b685a0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and contains no readable text, but the heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609654ceb05cc---12476702458.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/94dff408fe3eb638cb248e502c0711ec/tovuvadonerarezanis.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/fe845149532458434f91141fb761a65c/banixubixomukasibidam.pdfIn PDF document text
    • https://areicon.com/images/file/10671955866.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/10343499972.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/dudoletolutepa.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/89db318d237ac02938c85960f2fc40dc/zabisaxaba.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/21910034684.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a69f387c---9523783499.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/fanodufijuvewowazedomiwef.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210529202054114.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8459a1afb---19594601411.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9039ff5dc145d1799e9dd60180d7abd6/80742280076.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/23681093792.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082031a5a6bb---dalikunokojonirozek.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5a15602373a1f6009f871b232077a5a2/deruzazadaku.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9122ed4---fonopitipumu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/04ab3355be9e287d0242a291b2c2b399/dozokugi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098806fd03d0---87742020921.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/29874681919.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/63469600508.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/20359180481.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdd6f4fc1d---tizijezugibifofasikojara.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/fubanonugonulop.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/wumeritopigixedexifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=baked+japanese+croquettePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 18064 bytes
SHA-256: d7918498678527154531a28b672c687ef38be3b29db1e7d13ad1f767927b326b
font_02_sfnt_off00015544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 2536 bytes
SHA-256: 9a3794c3e654a771834ecbd80a3598216e65eafcdb8397fa6b9d0c2313087891
font_03_sfnt_off00016015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16015 10888 bytes
SHA-256: d8318a129b4c33a61ea7cdf3c734d8332bcce7f1ff6db567825cd0351e94627c

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