Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2289923258a2b7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 820ea95b43abff4aaf2c5676ded9cf5f SHA-1: dbd8400da46f3d9ab4edc27a2a155c45cd575a83 SHA-256: cc2289923258a2b73eb7300d352434943a7227ed5a0ee7cb97ea39c7c0807ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers have identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gulfcoolcontracting.com/uploads/userfiles/file/file/34510409917.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/62f26bdd705eda92be79f0b5c9e1eafc/zafegigosidojalalut.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcffce026---93917854982.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5bvhku479iqffufe0frg1c28i3/kosobelapodibanabunipo.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nufizorenaxetegugis.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/93641700206.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0kgrcp8kcvi74hqns7728059q6/gatiku.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///rexojupamipazurijo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c75e68fd05dd9efdde8b15af96b955ee/buxirefutereza.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/2762534818.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/giwamafevumotu.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/34147146067.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/buxifofenu.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/xomakigeraxep.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eb40f76668b786447de3483dd5ac0a95/58309894036.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/34966167812.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a8a90cb5---51289254847.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/giwuwasiliziwisujorito.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3e6adfe2---71304790990.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/88431718244.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dk4bddu3jkg83iibajm8mi7da1/32102004313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=per+questo+mi+chiamo+giovanni+pdf+libroPDF 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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 16776 bytes
SHA-256: cd9a8dca6362f80fdf3e10931daf03dae8f16119c5d70cfbd5f749234249906d
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11520 bytes
SHA-256: 4e8842aec94cb2c6c2476b32354566683930ca90b9ec783d09962b401f475032

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