Malicious PDF — malware analysis report

Static analysis result for SHA-256 d049c4fc78263b3c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-21 06:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: afb35eeeee8c57632a96a5404332feb5 SHA-1: 71cec96e1f6c9649f8486ffb227943a40c8ecff3 SHA-256: d049c4fc78263b3cb97db48646c40b83a541be5f6984b655f30d6cea5aa26573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/547i30eupfr14oqgh1rfjcuur2/nibarapup.pdf In PDF document text
    • https://aimhc.com/userfiles/file/xomono.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832fa3e801---guwakuwevigitebanigodaj.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/12203535308.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a2b150e8d269d42a3f06ad13103dcdb9/16414546503.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/529b7190bb480aa16c6ad803afc22087/11030869462.pdfIn PDF document text
    • http://uci.ir/userfiles/file/rojusamijujekutajopoxe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vg00jghj07j43i6qsno6luopk0/4497051421.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e89845651c---93530432610.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dd14e881718d36879ed6492d16a66bfb/daxalojosonumevufe.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/934b4be3c017d012454bfb0429eaa61e/rekevesabemujijud.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/pidiledo.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/20734102525.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/9219026442.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/67157070128.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/64c6ib4of35r0g00lfc3lrmqbj/94734709890.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/egtllh0bpiqqrnqpfqueu5g120/kuzodiwotujevalupuvigodan.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfad77d88a---futuwoxopesuda.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wudokaxasabovenojigosij.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/27328407878.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a734edc38c1b788a72352c5176e33c35/3650247416.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zamuvokutez.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d70fddeb7584f5779e8ba524bd12218/98025600081.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/suziritutibavexipudap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pork+shoulder+country+style+ribsPDF 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_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 10752 bytes
SHA-256: 0ae03ca6223df3050fb872e43ba2839bb5ac25cb645bd9db3a40de935c830086
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 17724 bytes
SHA-256: fb4cd171f9e762a543ec40b7d00406d1133aa09b9c5bec61a2eb65b3bfed27bf
font_02_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1