Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4ba23d6963784…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 00:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f1e586a99961b212b922478df6e00a6 SHA-1: 05d710ebcd54d299b29c4ccbad4e683209e5f8fe SHA-256: 37b4ba23d69637845731740ba1897fb44908e43c66bc285cee917da551ac155b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asharfilalkulfi.com/ckfinder/userfiles/files/xikosovafuvajovonib.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ede080bbcf1629a6f54d49506e031f2c/39142108345.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/36532920868.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/10d591020e274ad19a08ce8e8dac5326/1282308737.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6d44ce4e722686743a260cefd62fde58/jadulenalamutipuve.pdfIn PDF document text
    • http://lucann.com/Upload/file/77825245334.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/3800428181.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/20403523845.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/10d7e1cebf6ddf34bd5dd745a9b3f150/45793749602.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d241bc19e---gevumufofogekiriliz.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/10818685200.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/rorazaxefofunavavumuvu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5cfde6e47---zabiruxujusajisuvu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/oio5tdm1k09guurb5855clmhe1/vikesolib.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/dimegipanoxuwazev.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202108220236342157.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/xapukebaradu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d445ae53---34049560370.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e23a0217e---4613268380.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/79842715028.pdfIn PDF document text
    • http://jump360.co/upload/files/20210817225444.pdfIn PDF document text
    • http://evola.it/userfiles/files/9249045227.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/92120105792.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/6341069535.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7d65df4eacc88b59e2c56e4e451ca7ec/tejebodar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=types+of+pasta+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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 18552 bytes
SHA-256: b104cf83518cb931f3e35323e20d99d32e00b8c0055a20ba51a274ea547a9e43
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 10228 bytes
SHA-256: be7cdb918a9a81065599122f9c01fb46e0640a642bfac55e443101c88b9db90f