Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b035a9da337581c…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 20:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7802ee6b99af444f6ed8b24d31240425 SHA-1: 738549723dd9511531e6d1708448089636f71803 SHA-256: 4b035a9da337581caf7045a4fe42992ae504fbe316641abb46dfeabe59d66a75
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ascensionchina.com/userfiles/file/86547297865.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f9473f5f---xisiliz.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/20366519436.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d70ef31f419c7ce47463b8cf13396f17/16550769752.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4e0e37c3d16859859e61e93abcdfda89/58569387613.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jevisedosoxajebo.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xujanisake.pdfIn PDF document text
    • https://fultoys.com/userfiles/zebixos.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/64286114a1192f49480e48877945febf/nepawedirujabe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77644c3b3---rilupevozerujisuzowamas.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8e674178ede40fbc2a9b7aa3d3d93996/votav.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/zotesi.pdfIn PDF document text
    • https://pellevah.com/upload/files/14963749937.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vblqnebcg864mcbdup3ho0bmg3/67164173479.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/fiwosuwefuzajilejigezuwi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fgfr4fs03vt84ctn08blo3mpnd/52229240641.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/bujalawemiton.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/fenewa.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/vepolomadarukiwaduxuvow.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5upfad4m2gh9s1vjlgbv8h5gi2/19587637062.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210618_195104.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdcd37c0a---tupurakaponewidewakuxevat.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6c7231c46fa9288273cc8c2ddbacea73/geratafigizaditola.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b989f182602---lakidixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rsa+live+audio+assessment+answersPDF 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_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 10704 bytes
SHA-256: 7e30d923e8dc0b8ad47fa9b8b37c330eecb04d716df22edfd69ce85d448711e3
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 17028 bytes
SHA-256: 7742e085c434290bc19b16c6d31d05b42a292d0aec81e9c58e887ea7ef68d6fb

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