Malicious PDF — malware analysis report

Static analysis result for SHA-256 867ad83286a7658d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 09:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fafbe2c35390c21b851ef4d8273f71f6 SHA-1: 9730ef8f1a375f1a80b8346ce719aa53fdac1431 SHA-256: 867ad83286a7658d40ab5f43de401f6aae1b4ae1e69d885240466a770fd374fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=boat+autopilot+system+pdf PDF link annotation
    • http://botosani.ro/img/uploads/file/vafimewufenukitovugisevu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1c796f5ffd6e3e0e39ceccd9c6ad1ec1/fosowopewokavirenozim.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/61944199129.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/radadodunobavajozid.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/riladomisabogeboka.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5ba8f7c8953178afb1ac9e819b395cb2/givonikijilexot.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pa6ukn6s8268lqj1t4vk2iq056/jopulozuvitob.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/78594475877.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gukawokux.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/26068291316.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/wuraxip.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tuxoramakutudefu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160770d4b7ea70---faxejug.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fec9e5d5736f6d589e9ffa9e4396ff3f/76453968200.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607605d244249---91042379454.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/fobokilukimagoz.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/pebekevovolisuzor.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160894a535a0c6---rexesevakevi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e95d7ecf5d---temozeruloxedoso.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/lufadipotivixi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/fepajimo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/700f514bc8ecb09d5978c60d0f521d70/nopogovimokogimefuj.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f365f73b25---45985862310.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_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 17604 bytes
SHA-256: 0aa9d0071f9bfa3865524115bff1b8120998fe3790e81db412f40e7a7b928b64
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10724 bytes
SHA-256: 88332fade09ad7247171ca3c66de4c89d140729e6e40dde196951715af8e3cdf

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