Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b09e86de59bbc79…

MALICIOUS

PDF

93.2 KB Created: 2021-09-01 13:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d9d90754fb2ddc827671c5a92ab861b SHA-1: 001c53f4daca357dcf9567744618231149a0837e SHA-256: 4b09e86de59bbc79d8840866097a5c6f844613af90725e1210e7130b2311c491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. While no scripts were explicitly extracted, the presence of multiple external links and the nature of the heuristics point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kaiyudachem.com/filespath/files/20210802220541.pdf In PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/90261309540.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/31799589754.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/kigivolifuxogirifon.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/57chgah6veavdq9glamiqa3kur/59012397102.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ln810iv55ql92r7dcbi9lqojki/kidisasilivo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80816dc3ea---46260664353.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/98078722879.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e233663ce---sudibolufadugig.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f43696ecee6---lipaziza.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/bisafiwitunuxewadow.pdfIn PDF document text
    • http://risme.vn/files/zepuzajotojesibe.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/webozuxudemigibara.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d246380d6e7---13599606208.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f02ec513b48477f47e509b8619e3dfd/zemasafupezezot.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00ae7a050---fowipokejarikek.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d4cfb8f782c52e16952c2ceedc8b75a6/33857691371.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i19b2h1va30hrt44p4g75th2tp/72275895391.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/646ac462bf9aa272a2a23c7cf4af207f/bikagidesivupevapixaripo.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/dabamop.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c476eb410d---disufuvesoviwutubidedifib.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/90188931145.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/95835850938.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/89615829347.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107181056058575.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f25c68a1---kedijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mike%27s+new+car+2002PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e971.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE971 18020 bytes
SHA-256: 54036cf7701c8cef7a064edec0c34e8c30b13173397e43aeb1c202cb0c37ffad
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 10404 bytes
SHA-256: ea3244b5acc2aac19e854ee78022de10542b10a4459046c627b3d6f328e18df6
font_03_sfnt_off0001356f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356F 18512 bytes
SHA-256: 6b0dbd796d8d6e4abf765b28c8331e1e42b225f18f2c0748abc62093532a3c0d

Open this report in the interactive analyzer, or submit your own file for analysis.