Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2542b448eb72f65…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 16:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d8ceee33444d41bac8ec64351f2f119 SHA-1: 4dc0193a9577027c71dfa721f09d368700b9b012 SHA-256: d2542b448eb72f650933dd4f2ef85e943fba32b7bb51f148982c842d5b2a6266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of embedded JavaScript further suggests potential malicious activity, such as exploiting PDF vulnerabilities or redirecting the user. ClamAV detection as 'Pdf.Phishing.Trojan' supports the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prestinoequitacion.com/imagenes/upload/files/kagumaziloxunugo.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/12804168018.pdfIn PDF document text
    • http://willbramephotography.com/niliz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3m32ipfoma1s8g02l47521c04j/37569691125.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/75fa0bb1fb45eb19eb328b1944056aa7/zogasonorujaxabukobuvim.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/wumilodigiwapemaja.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f524f50227---41257553935.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b88bbfa5743363414f382b5fddc3f021/bolomitug.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/97404508066.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/lakozufodedepozaw.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083be996c10b---bediremixup.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/miratodegojubuzotife.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/wizurakofanuteledegarofe.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66f6053771719a749f3a33ddd3b4f4ce/48558887014.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/8619997623.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2872046948.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/049e5bedb116629155b3d2a08eee61dc/81278428369.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/22957126139.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e03a8ff27abd4c762e7c2c34003e6be2/bibifanomugimupujazu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/900bf2d05b78a18f985094a7d9b7e725/52660484114.pdfIn PDF document text
    • https://securitydm.com/slicice/file/kopawuzekutupuvesixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=production+analysis+in+managerial+economics+pdfPDF 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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 18032 bytes
SHA-256: c78b06e92d9e1236bf6d858a38864645f28bc2ff3450b126f938318ac205926d
font_02_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 11180 bytes
SHA-256: 981f0af910f50382cca9262103c84b559e581ef3715a6c33ae9f8b9536aa47d2

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