Malicious PDF — malware analysis report

Static analysis result for SHA-256 67455a0c53d34a0d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ef6f6fdb728c56f0dbfe8f05917ab2e SHA-1: caeb943db448815fce6ee47e04d7df2f2d570d10 SHA-256: 67455a0c53d34a0de3146eabb8be0023a8ac4620129b502c99453bf717f2553a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The PDF's structure and embedded URLs suggest it is used for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=revolucion+industrial+para+ni%C3%B1os+pdf PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/58768194062.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/duxivoziwusofatujoros.pdfIn PDF document text
    • https://pepsima.biz/files/file/puxumazomuloraxo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae341ee9a9d---986994453.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63655137696.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16111bdea38ca5---30594963659.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/zamunokonovajov.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ea7a22aea---duzudidabozo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/mazigusewerepofazo.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/26585961131.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/22d134859412e544ddcf3378fc21bf63/xoperisegexavi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69240116883.pdfIn PDF document text
    • https://12shio2.com/contents//files/logupexepetirulirugamixi.pdfIn PDF document text
    • https://medius.sk/userfiles/file/31339668677.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g45fkqjf8bh3ilf8m0kjmarnul/90744968726.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982c405fad7---91639258974.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/jenok.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e934a436639---bifabuwofafonedigefile.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caca1504ad---15930728166.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jizevab.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/36d4534e689747b6abf51a3d0991522a/xozowu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ppc259119pq0udcbc3gighh36p/42314953853.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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 18264 bytes
SHA-256: 6aacd170c4aaa7a166cbe4a5f3b2444eddb639c67cfbeb9040cddcd958dc3081
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 11028 bytes
SHA-256: c97ba5aabc2a3bfdfb920f0ba788395a6c65380db0af0c9426088fa139f84771