Malicious PDF — malware analysis report

Static analysis result for SHA-256 176e4d36cd013109…

MALICIOUS

PDF

94.5 KB Created: 2021-06-29 20:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efc82ca3dff51b17a4f2f5fb0f4fec93 SHA-1: c958d82129eedcd4219bd32be1da3439c611606e SHA-256: 176e4d36cd0131095dfce6501f37d79b0af55e1aa0a94cb89afb1ce7353b7161
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external, malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a2f73d5c8---54048546664.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/775c267909ee131d683c6b524717a193/48311072165.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44848199795.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/15a828b9d6dc1ac50594f94e434cd1e8/41634144359.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e7d7728d---lafexujuvefi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741f38b3f74---rabumeluxedetokujeteled.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/88345510279.pdfIn PDF document text
    • https://hse.tw/upload/file/17011372805.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/9878504070.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c6675593---xolosizukabewuw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bvqo6bv6i4b97ocv93rq9qq0nd/gumub.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/dedimaluloku.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a609857034---godidu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138ee2ea92---peretokutofuruwetemit.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/35592205124.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v839lk6omqvpqi5l2thd2a5s14/kofujipibuzigag.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/38671019782.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aa224960e2b---96094899096.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/8675002912.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9cc12963---51324607309.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b09730fc---2505534331.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/nmvqtuocft0sg2crf734crmulp/gusepotatigifosamamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=repeated+measures+anova+in+stataPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 16808 bytes
SHA-256: e4dd7596bafbf33524dd1a041d78c1e18ece79f622bd684aec635bce2846e61a
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 10720 bytes
SHA-256: d70b51f87142a5ccaf2da81016a1f3a1018a3ba86d1b1a3c6368bdd1343b0bde
font_03_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 21044 bytes
SHA-256: a10b79c8a9842ad620a4d9caf4b7e629b22343d602d6a6c3a9d7a649569656a6
font_04_sfnt_off00016385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16385 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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