Malicious PDF — malware analysis report

Static analysis result for SHA-256 d822e08ba75f70b8…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 828ac157072b5dba64cdeadab1e2c8a2 SHA-1: 62f6d4592e3eb55a41908ce497a2427d88681562 SHA-256: d822e08ba75f70b8d322cd77f5339a5fca759beb1da0dde233f7a2206f87ccd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834c20cb22d---duzagugaliwajifakomus.pdf In PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/47450808125.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/toviwarisepipajo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0be483fc1fb9a9c557e87b2e1dc2b1b2/mazonamutifivamudod.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/47948675623.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/94430896264.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cv1cnbcialiptko23b9n0nrb1n/gafukobupilexipajavew.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/bijozudarajop.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fuguwumaki.pdfIn PDF document text
    • https://kawanmto.org/contents//files/49315914057.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/499036246fcc0e63f1d37d2444f67133/libunowonerakezabefeliru.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cf9c2a8831480be0e23682b702fd6617/zurifezuradalajogij.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501030125825575.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/zovilunivabazenujov.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5a3e76b9089f046cb2e9377127b36947/88722435565.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/94566428653.pdfIn PDF document text
    • http://cecev.com/stockages/files/gudota.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/nizumisejaxural.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/51236353451.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a7cc95a4c---1918095303.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jajiraxipejegerirafodirel.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/1483509202.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/87749019305.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/91b83f119e5766bbae63e272e7ed7dcc/bugumogeruxavugibu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/86233095009.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/23541219984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=data+protection+and+privacyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 18924 bytes
SHA-256: e4e75ab68b9e3e3d2d6ab44f6e693d8af0f2678f4ef9493ca1c8ba0bfeebd6d3
font_02_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 10472 bytes
SHA-256: 3531bbd8e0937d1e5b8095ff541b385b42f6d7ed8b6d048bda7e26a7f2a91912