Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d097441b2b490aa…

MALICIOUS

PDF

97.8 KB Created: 2021-09-14 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82ee5fbae9d93f00963a9c1424a4b34c SHA-1: c85395ab70124c1a1264449922c1a84204ece904 SHA-256: 6d097441b2b490aaec31c16f359bf834ca4e56909b772dfa3f1be8e6097ed5ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://smidgel.ru/uplcv?utm_term=minecraft+pocket+edition+skins+android PDF link annotation
    • https://cecprint.com/images/file/22120209294.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140251598693---22780154693.pdfIn PDF document text
    • http://medi-sen.com/files/files/14303177047.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/rivuzaxotupiluposetexa.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nusubonefokopaf.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/17186397784.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/4359050844.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/11476499295.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/7706452725.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33344078782.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9444632601.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-10/20210910185727236508.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/pinexodamivilub.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/92079925248.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/08/66441373496.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/83794396599.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4eb8d5c8---rovovilurapevuderevawo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/zakewosujixupowizigafixu.pdfIn PDF document text
    • http://torgoborud.org/images/file/kiwifatilan.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/wotesejibapesasesojefu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3dd97dba1acde7469a912f67db95b6b3/61500755895.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bd3c36ef3ccf36e42a0a7f18e55ee4/45310511730.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/6662352592.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109031219541503.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9lfbv6db4vpgdkk4hc3lu6hhbk/9769887243.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139355f83420---wezaxikimimiz.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_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 18492 bytes
SHA-256: fb4d620c2249f6f53d04e81efbfed69650d001bc8ab8ed633f53401ca775ee74
font_01_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 10652 bytes
SHA-256: dd49a2571311f78dfceafdcf98fefb89a39c54e02256f13164e19646fad65585
font_02_sfnt_off000160e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1