Malicious PDF — malware analysis report

Static analysis result for SHA-256 437542a98f517128…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b778e7339f851adb0920bb026763509 SHA-1: 1d2f2f96e37bb37fcf066487d37bb65169dccf46 SHA-256: 437542a98f517128cd6459ba99448569d4afe017d3c0ac779623613946b67349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=lulubox+ios+apk PDF link annotation
    • http://hepiran.com/cache/fck_files/file/bofuxuwulimuxafix.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/natimiluf.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/eb8c499a9b05f39cca3bc99daa275d89/62250616145.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/zasowi.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/kubofawiket.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/32678977207.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/88249941121.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/dijabiwanowiw.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/39858068421.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/13334263417.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h3g828ubt8lmiamibeie4fibj2/88460243341.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010601186592.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8db20f5e14f6bb15e6c92250ef425fc5/sobexidazuzemivigajoj.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45378907.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fmkj1q6e6qi2ogjb15ncd8lklm/womogususilapewik.pdfIn PDF document text
    • http://trieuduong.com/images/Download/fevewiwefe.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/kinelujorum.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140517f1d456---zuzegulezibir.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/rupor.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/efbd2167dd6ce8fc436eb8c643cea1ea/49417324039.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fosaxolekuwemigepebixeno.pdfIn PDF document text
    • https://maisonforville.be/documents/file/doxebolimemek.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab4a25720---xojasirejugatopiloguloj.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/61457383913.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 10200 bytes
SHA-256: 5e57e5bb6929e9c90277b343e5de86aef87897a1cb927d54beb5397d60507fdc
font_02_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 15504 bytes
SHA-256: 9c0ea29c60fdacfe5471d0ae0d16602d8ef4193e6fed9caa1baa651d5d3bc598

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