Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bd7ab00023b5ab…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 21:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7e8d20efce029f7bb48f1c216042aee SHA-1: ef1fe839c0cccc98dac602cba4ba7930a6863c2b SHA-256: c8bd7ab00023b5ab9bf97875faae9254b91eb495147ebe1937ad3c004367acc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS upload directories and disposable hosting. The PDF document body is heavily obfuscated, but the presence of numerous external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fa54d80a---boridesukizorivokajovu.pdf In PDF document text
    • https://dusunceokulu.net/resimler/files/savorisemudugexuregodenu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/13781715542.pdfIn PDF document text
    • https://teamcode.net/upload/files/59832769715.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec609562e7---85112487588.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a2eac66e5---sivibokosidope.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/685c05801a8e56b4aaa0966dde544e7f/xojolaj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/r8tc2nholfl8c0mhajpr4jpe95/9983989409.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774363ac088---23841364066.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/wexavelevaselisagojib.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/54891836144.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17944565e---11226051588.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zosizusuvudigeti.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7aa6bda1---wivekakoj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bavojezuwufewufexi.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/gajexakikomomudukigerux.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vexadukewevujagirexeteji.pdfIn PDF document text
    • https://hojoairport.com/images/file/vizezomoposenirawanisate.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/ragivivit.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1b3e1b50---35108278460.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/luxitufikewokoxelod.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/91026439871.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/71569014195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=discipleship+explored+handbook+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 17376 bytes
SHA-256: d29d547df1321e61b5e358076f3ee4cf1026b14f28b7f732ad1c58fa15871627
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10952 bytes
SHA-256: 159ce63a38aa8ee5941942acf21c3d947adba0cf3405400184329cd2e60e4ec2
font_02_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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