Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b8290148aa5ca…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 00:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49c91ca4bc252454140606b841ba3b58 SHA-1: e9b11de07b4879fb7d135e7ab9f2a39c120f4c77 SHA-256: c27b8290148aa5ca54e36d75b817bbfe88ca9f2da969a684318044a9fe152585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting it is used to redirect users to malicious websites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=source+of+answers+crossword+clue
    • http://kalmi.ru/upfiles/files/wujavimeve.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4to5vfse0jducnrgk4vbb0a9e6/68879131889.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tpdjpep18dc2fvtq1hvh8mtt1/jekexiwesemavatali.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5972d6faaad6a2dbe366779943b1be34/96166511928.pdf
    • http://esoftland.com/userfiles/file/68648122446.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/pfbn9pdfr0od8o02ajovnu7rl7/17648552241.pdf
    • http://cesurmakina.com/userfiles/file/39087204779.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fc0f631cbfc9a87d552c4bc5b850946c/58457908968.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e31d938f070fd12b64c239feebd59d7/wuzisekirawugeji.pdf
    • http://szao-spb.ru/images/news/file/mavud.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fb52c6e4---lareju.pdf
    • http://ecohost.ru/pics/images/file/xevob.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/47262731680.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/66f8ef9047f9cba7ca5e922c0e4eff20/gasaluxojebimewamupamuxu.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41f0bfab8---rofumikawuwujot.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794f57aa550---28011829528.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/47461217176.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/57227953195.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/xegepalo.pdf
    • http://purofirstli.net/userfiles/file/66906186727.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f1f4bc58---sogeruletin.pdf
    • http://esthebel.de/userfiles/file/74483748524.pdf
    • 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_off0000f1f5.bin
5fe52a84a3f6296eb89018ac3a0c4bb903601bbaa3303abbc8f284364798ea30
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 17840 bytes
font_01_sfnt_off00011fea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 16792 bytes
font_02_sfnt_off00013801.bin
63785efa94a5b45129aff04c7a5fa4a588ff3cc0724355f73a60975270dbdadc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 10540 bytes