Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f93483066c8c76…

MALICIOUS

PDF

82.5 KB Created: 2021-07-01 15:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a191dc4e3cac7dec15d53334acea695 SHA-1: d087db62ec5a9c6bbb1757aa75b2ddbe88ccefc3 SHA-256: d4f93483066c8c7612b44cb94ede88ad4f2f30de76bb64eda9c3b67e9ccf077b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=energy+cost+per+kwh PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4f77lnqnoouis29l0qn1d5902r/geletinesadevixaf.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf40e0b1a---94330185955.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5c3b7d08---fakopabuwinitajegavinik.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/fupas.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ja5m0gquet22bkccut6170lcup/fototeguvesigasufeduvasag.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/14720052292.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079078635e6e---28739377709.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/96230996285.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8acdb52568---75976784742.pdfIn PDF document text
    • https://andana.us/files/files/levizekidutebulepijav.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6d892fe9d554226a4a0ce859adce98f3/7373680712.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/40sli7ogi93kl3pldabf0nkjo5/98695088755.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/93176218663.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/85835988291.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3de621620---51349850862.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/9upv86vrjbf8tvs1gk5ktlpjm5/natoxebus.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/60348392987.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/titiwokudibubidukok.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27ceb118e---33686706484.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/22166832567.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xeradejifi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099448601228---88257439617.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2b17712c99c88f4937377d211c83ae8e/dodegitukivobe.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c688e2e70c---limigipivurifenuxubeji.pdfIn PDF document text
    • 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 16312 bytes
SHA-256: 2a48cdc138db70d8135f69a7e2ffc1e421cf2e7f0a13452fee8c2c87f3ca3ff9
font_02_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 10628 bytes
SHA-256: f9fe18ad7f05ffbe913ef3e0bf52013ee8c398fba2095d2a3a50150cf77ddc69

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