Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc784fc30cc2f0d…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 15:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b45b0cd536931cd66b62ecb3cfd484d6 SHA-1: e2a19dbb1b675ac5a918e4f9bba67df4a160742e SHA-256: 4fc784fc30cc2f0d4bdd4b6945094f9564e1d88ebe9066e12d07abdd86491e8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://a-swiss.com/upload/userfiles/file/funegorob.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b05fe0e1ae0---nusinonar.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/vazetokurixirowegi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c84bfad9---natuxaxizixaleradoju.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tgog842mkqk0beicnjn5blgj22/73164514747.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6927163a9e25ebf7d48f52d658eab80d/30752119548.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/41345678236.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/486780b3a24af71ae680e5c8c8c693db/97841752840.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3mamf5hntpn4u6aghd8oa79ot9/taxudiramowos.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91ec77d8c---lixobasofajawonegomogejiw.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/13228846497.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/10663535641.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704009012a4---jijasititujokinupus.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gazilemedono.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b66503082---82751171261.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c441cab0a6---71755752667.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bc529c3a2eca618423daf5cb8c588268/34460367529.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c80d87f62232e1948d2a93a8e795aa61/39980396199.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f0d29a6c---gulerojisisizukap.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160895f729291d---tokekedunimilesozanunofis.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003649bee2---xivafufegavunusopanopeme.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nozabevuboka.pdfIn PDF document text
    • http://bdn10.cz/files/file/37458600857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sin+and+the+second+cityPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6afdd4e9---18556168913.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_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17360 bytes
SHA-256: 88ec83da16fd1f45c9ef1b0f2ae6c998145c0ccd37b65e2278db59e6d019fcfa
font_02_sfnt_off00014360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14360 10512 bytes
SHA-256: 6e7b88d80e74731d75891ef5ed3191db472ced4ad1cec3642474c9635ea2474e