Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec512636ef00a4d…

MALICIOUS

PDF

126.2 KB Created: 2021-07-19 20:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd5daee996f741bd2083ca2f6935b879 SHA-1: 2075cbd1bd3be57710211d70dbdbddf0ffb7318f SHA-256: 3ec512636ef00a4dc87685a9b7e0c21ae470f2eeeadc2b4118a637e191a5bc7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites. These links likely serve as a link farm to distribute malicious payloads or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6332208---mofixapuludepokop.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3ab07ae23fc92021b4c222191754573c/47372014765.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/536a1fca3c79206b138125967986a398/76423717701.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5f34e077---lozosafafi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/57465028950.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/11348561300.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/77920985241.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5636084566.pdfIn PDF document text
    • http://huiking.cn/uploads/file/020750002420.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/945d766fa4f29f93866d0a973985289b/titexas.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4660d2e19e---6073423608.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a707c35992---36923962622.pdfIn PDF document text
    • http://mlight.cz/archiv/file/bujovomozuxinexuvurej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4a463b1f---tususasuzobazotamutumoxo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/roguduriwibiduduwegadi.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/12925156151.pdfIn PDF document text
    • https://aneri12.eu/res/file/7717503188.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160951c90b7316---87516482418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b877b09cac---nutibuposukimakot.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/313f7d4fb82aced3f1474b393272e5b6/vogukekekejaronibizimuki.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/75112916501.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/takevudaxofa.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/makejisiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=project+outline+example+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_off00018c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A42B 17548 bytes
SHA-256: 64099a7a58818e3807dba7dc4a72381807d10becdafc7d431d59fafa2a951990
font_02_sfnt_off0001d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D251 10944 bytes
SHA-256: f68b139a47c092852d938b1654147be0dc3f9482082cddae831e55aa7503ae70

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