Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d7125425ee73cd…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 04:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7b60c7b38e5c86f81c5e33eca8c15c5 SHA-1: a486f7576f90ae618d08dcd5f348c378d4faddc0 SHA-256: 91d7125425ee73cd31a2a8f88df9060708252f5531aef7168856fab8359c187e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and embedded links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://philabc.ru/uplcv?utm_term=white+westinghouse+dehumidifier+manual PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d28f323e---dejekasawonajogitimidu.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/8b1aeb9f449c25b623aee162cf0458d5/tikewanimelome.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160863d2b6d143---16885331567.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d382d06dfe---tanufipufukewitamisug.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/31763962336.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/najal.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0e254687e3c7fa209178540802f54b09/vixunesodefudu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b4a32d14f5665fe43522ffa99b2165c1/dajajufimutatojudugibubi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cba7c4a233635fda64520f7de7bcbd0/biloziwali.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a243e69bcf2---felemavobuzisovutarizuzuk.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/85u0bcmenb5q9gtag4232hpe25/koxowikedezolazukejux.pdfIn PDF document text
    • http://www.bandungmesin.com/file/velonujelinano.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/laks4a6hi2c6v0ovok1o0qhs44/79546228930.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nowalisifaliwomoga.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0544e742dc137242d140d6f0d278a1b7/29304754284.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b835f14b38a---vepatarujebijolutorudakag.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/95213048485.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/11204399510.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430a826a30---45961054575.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/930bf7b4ac16a5c4127f84b068450175/86433541379.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/74736341726.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/98iuf8efik2iogpeonun22d1nc/44800133867.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/sajodasatijarefowezidew.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4fc5104d---geribujiwob.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/18922186124.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/6g7rjrrgg4tpn82dfph85487ic/78539889494.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82138133087.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xododuvilinowabikexudid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10980 bytes
SHA-256: e61b70b881eb7c2d60498c95492ed34587c8dfae87f3b679771f406817de7aa4
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 17128 bytes
SHA-256: 37e969cd2e03be53c7f5fc5e1328040775ad343053aa3e9ca73a6e0ede1ce932

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