Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2e31f3a3253eba…

MALICIOUS

PDF

82.2 KB Created: 2021-06-28 00:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a70b8805cf4ade32f9a9315ad2cd6dc4 SHA-1: e22760237e234c40e376abb092e57c71bb0c0cce SHA-256: bb2e31f3a3253eba614bd96fb1e10119e8960fcc594f7bc3a7f881544b16b0ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The presence of external URIs and link farms suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://crewmak.ru/uplcv?utm_term=real+time+computer+control+by+stuart+bennett PDF link annotation
    • https://drrajanmahtani.com/userfiles/files/12374615956.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/abbc511ec22a44045e67190001944558/nefawimo.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/14185193575.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/b7c4v74fi6j9jb4mgn3rssh47j/98509116644.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/23/file/20210523_151711_190.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6de585bba06cebdf5b977d9b14730ecd/79112716084.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1t9je8s611jej45ogovm6fjmfp/xizol.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/77568026170.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4a292137e5db9b6676a280d91c90dd7b/69406995462.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9e9373316df3297257c152bc593b3fa4/55081895899.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c506db03---46547408882.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/97014173438.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/217c3462d6fd4a256a4b663d5f583ddf/velova.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fiponixobilavarafomog.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7adad178---25470307402.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/152c35b22eb092de41ad432090b6d53b/94333462379.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/59395397919.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0121cb6931---63460397976.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e4d4fba6---kojemevoleg.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b589bddc0d---xotunet.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85787230451.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608569a3717e0---tuzikazawituwawo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aad3f76b0bf1b8c34c25cae11233f591/1693836958.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/3742404281.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c84adca55e---28483964032.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011845.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11845 19424 bytes
SHA-256: 87fdc793ffc77cd9ac7ba76fe7a2244fe392acb06afa36245da15737d7e77ec3
font_00_sfnt_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 15916 bytes
SHA-256: 8a0d906da2081f4602ca0e0a7001ba9e902ac026f46de97500623bcd289b8b69
font_02_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10936 bytes
SHA-256: 3006c67c232f9dec53225468bc0ec07735a35975fda078372cf6f4d3b001bf92

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