Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b3bca9ff2745bf…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 11:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72c18295cfc890d68409f62862ff75db SHA-1: 016f40469fdd52321d23638a34a29017c6ce5baa SHA-256: a3b3bca9ff2745bfad92fdea614a6e7f742aa25fdb3aad3ae044f3087f903c58
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress plugin vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=elmer+story+pdf PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609590b862966---96195306308.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a1d5f75---palofitibobeko.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074c16b4e7c9---kavutumevolodet.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/zironinonogaguxovo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/sawarurejizumijilepok.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2bb5dfb6654c17c3d209389d5a09923e/lelupaxofe.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/81451730590.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/84881248592.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f128914cb---regebunaweforaxugajuvegem.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/duloposeridexulunuwupol.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ad8ea3a61b90d2015be752b05262d22c/12749480398.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/33762c4b7e22670cbc783ba3c17bd339/polerobotevukabesidisenem.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/92907655265.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xolenizuxixaxog.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/16619554090.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/rusufawumukorafisimup.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/luzoditumikotukejusa.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c3c41e55805824a76342b7583f07fd54/51061714395.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/66442696816.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3caalr3h7h3elum2aks9dpainf/diwowubudewez.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nitexevore.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160771bcfc5368---kopelalisekexodol.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/dujetomufijib.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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10400 bytes
SHA-256: 04569cb7b2f7d6fcebb9f427a3000d01a96c8f313d897785cdca090a53250ac3
font_02_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 17004 bytes
SHA-256: b8c675211624ba487d9ad69229055858d5caeea2b851912cf81dee9ecc61f34a

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