Malicious PDF — malware analysis report

Static analysis result for SHA-256 971b80bc996e3626…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 06:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a906bfce8a74a33f15c7e5542db2a4a5 SHA-1: 6d1c42e2c7c93f12d945c6e7b4c3694d6888f623 SHA-256: 971b80bc996e36263a242c10847f1f52378c8fcbce5906562a27fd7a12379f3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiolauramoschini.it/userfiles/files/xosigofixivo.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1352g6ahr963q8jubpjrd70si/vedubunupiboz.pdfIn PDF document text
    • http://learningkey.org/userfiles/gotusutubijakivu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982e3f1250f---27211675407.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3635248bdc0f24366fce874c072b3bf4/ragijobewefigujilimivax.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tanuxepalukegoxovefodonol.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/37012338475.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129038adf6d9---depadedevepad.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1b3193f735c744c68371d438a26c5934/velazusoxavurusumidujana.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/96020786986.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/45353625547.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611606b05f833---damisikibevagigebame.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e3066f33265---pamosovizupoxu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/403c9884ed53d576562a35063539752e/69996836541.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/94825139183.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/66aa4b924d72fd8621a7c368b784f493/sawobatezages.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/45026351304.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/mupur.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a59479682d8---fitewowud.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/85982012064.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/bireledeveziwek.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40009728893.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xupodo.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/pafexiligusadarev.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fe741c2794fd654e3de35a4a9ba7e539/rorizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=managerial+round+interview+questions+and+answers+for+experiencedPDF 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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 11288 bytes
SHA-256: 81eb0a6117499d829098d4aa31fe3e6b5ea4855f8eeffc9ba10b2edafb206284
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 17912 bytes
SHA-256: 9f1657b6c97512ca3eb1cb95f240ac5cf03c11296c1666771b42e954670cc936
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1