Malicious PDF — malware analysis report

Static analysis result for SHA-256 081ea82ea6ace6dd…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 00:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d93082a6d1ac8a92c20cb1f6d4e3da6f SHA-1: 34ffec3076300b17c00057ceb6bdfd94f7aa69fe SHA-256: 081ea82ea6ace6ddfa9e89eb1399833f77763fb0dafab08ee42e94fe0ab12613
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the presence of link farms pointing to compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://inwebjor.ru/uplcv?utm_term=vocabulary+and+grammar+test+unit+3+test+a+answers PDF link annotation
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bca10889043---94533974927.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hotd6743a1un7qnp3jibeho8i7/dowatijavavofupen.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061213565723.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210616152046335754xpn5acglbywa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e88973cad814b358524d5687c506ed1d/tutanazamoxofenonalubovu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/633a2f4ecc37136f887a7584ad96524d/25183560008.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7e5911f524d9706056778e6e86bd575f/tegita.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325a639660fca359e5ac8d2eec7046af/luleguvilamivezugoxaf.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/kefawadefa.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/14995181826.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a329f4319c4---3407327952.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/50297375130.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/114b7cd387e61622c5a03870550cfacd/sifodebuwudijizo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4443b76f---16254600364.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51bc3c11b---fapamadekob.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d2726097---91609478730.pdfIn PDF document text
    • http://furniture83.com/upload/files/puburalevujowonazapi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sr35m56brl1febmlpafro1bb1p/dafosivejota.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75a75d5b5488fa8560b0a52238ae81cb/33842067098.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72ffdad44e---nitejavez.pdfIn PDF document text
    • https://rosycaffe.com/file/87532709443.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/k4j4725v5bpgj9vephmnecfid1/fibirilafogukovagi.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/30002356752.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/iggncpia6flh6npci4t4f9kcf0/75728853481.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13998b176a---75576568770.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 17792 bytes
SHA-256: 2a5f6f54e85a3a7b02d9eabedc89cdd5c2eea4254335878294675313fc78d7de
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off0001484a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484A 11292 bytes
SHA-256: 43bce2b8b81617d54b5a1bff7f11803e1af2cdb713b9eb403111187054cebfdb

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