Malicious PDF — malware analysis report

Static analysis result for SHA-256 8714aaa25430e857…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 01:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b1e59641d8eb34b69f3b820aa3c7d61 SHA-1: 7e6d27cc96b8f5f145c0eb5376e7e859aa58a2d2 SHA-256: 8714aaa25430e8571fe1ad82c23f67e85d52d1bcf5fc4d12ae08e8db0abb34a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS upload directories or disposable domains. This structure is characteristic of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragisaleforaxifu.pdf In PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/xefefuwomerujuwulaxi.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0342754---82948718775.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2s3l4fpini9rd041f040bh5rr2/22972262907.pdfIn PDF document text
    • http://sieuthibds.net/images/files/70008897094.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798e27c04dd---fagirukovulamumiv.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/21972423195.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/716qe1vie29ojeh4fr60ejqq8j/24612648979.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2125e50d34---98961317001.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c062d2f6e4---pegutofobadimuwe.pdfIn PDF document text
    • http://learningkey.org/userfiles/tulutil.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/12441820003.pdfIn PDF document text
    • https://medtek.vn/storage/file/winem.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0e3d00ab---penudogo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/75028805627.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/31104898910.pdfIn PDF document text
    • http://industrialdevices.in/uploads/89955648591.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60264ff10---fuwazanel.pdfIn PDF document text
    • http://iwishop.hu/file/47045791155.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/99214797534.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68dac64b7---45570361348.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/84669475908.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ssk7uol3m59kmkvr70iqh2jrj2/28023376216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sanskrit+counting+1+to+100+in+words+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 18916 bytes
SHA-256: 71b269bd4bc32934c7e65e9a436f9911f46f8c7ef5aec1f2540390c64de92331
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16456 bytes
SHA-256: 7fb018a3300581e6dcb510600caadf6d4ad934c4d9db96dae7bcf40dd36a5763
font_03_sfnt_off00014244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14244 11144 bytes
SHA-256: 84c0da0a1bf8895d46ba9096790cc2abd54d5243ef8423d9b4b3d92c84e2304e
font_04_sfnt_off00015c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4B 1924 bytes
SHA-256: 46f45bc4408787fbd5e23caa7fcdcf0ace6d9668e224fb582b670930418199ae

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