Malicious PDF — malware analysis report

Static analysis result for SHA-256 894c87dca03ee746…

MALICIOUS

PDF

80.2 KB Created: 2021-07-02 10:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faf99995a10b91dda13c8cf180380914 SHA-1: 50f525ab187289ffcd02e6a9bdf343828862db74 SHA-256: 894c87dca03ee746c26c9c79272c59af059f99e1b656c56cd338a74cea11d6ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://247hvac.ca/fabulous1/uploads/files/3749250333.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c72315acec1---98588581496.pdf
    • https://stillwaiting.org/userfiles/file/simuwobozi.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987bb6e1d4b---laxevaziz.pdf
    • https://cubic.is/userfiles/file/gemorosekitara.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4db8a594---kamavovax.pdf
    • https://nibrasimansch.com/userfiles/files/56880476027.pdf
    • http://mnogonomerov.ru/uploads/file/42647886101.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813a887a46---tedin.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b22584832d560f7dcdc807f39d4ee04f/39479321545.pdf
    • http://strahovka66.ru/userfiles/file/93457255970.pdf
    • http://besttailor.info/ckfinder/userfiles/files/3146413010.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e3527753---70045275973.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a44d4db98dc700bdbd1e0e0dc48cf4e2/lunosegupe.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ftev0buiaa9luc2lnmjo3s35ko/48617305804.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/haivhbc2qcdrvtle6ae8j74at1/piteginibonavorekedalusu.pdf
    • http://aj-logistics.com/stock/userfiles/file/47340795384.pdf
    • https://groupunsur4.com/contents//files/5016902401.pdf
    • http://hiddenforrest.net/clients/76790/File/36400273914.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acf39fb5f---50456343124.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b62f8c0b37c2ad7a2f204f261419df29/finijuvizevixaxipitu.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b201aa2d---visarakevikitotakunosub.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba50164c957---kemasipodagebusibugix.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d286abb647---morajivegoxusijat.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b281f0b06eb---69577696249.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=enchanted+learning+mitosis+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16792 bytes
font_01_sfnt_off0000ebdd.bin
1bd880e06525dff41cf7598ea21eb008b6107f7e9591d71780de0e956e253944
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 17576 bytes
font_02_sfnt_off000119ce.bin
3814ec757204037f904fca372e853200fa564095a571b8fa28a7e4a6551e3d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 10976 bytes