Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc5ae9ae895615e…

MALICIOUS

PDF

76.3 KB Created: 2021-07-08 08:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd2a0d535f6b0842a6511347c45b2b53 SHA-1: 3f655d8b74e55ccf6ce26c2279a87fc0a03a0409 SHA-256: cbc5ae9ae895615e446b66282ade9772b0e3769ee9867313b07fc48878b1c629
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ljo3osr7bmrba94boeqcni88k3/42512498869.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59bfe70f2---46655843516.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/60219502964.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/eo48ovf0os9qhus53ldph8m5u1/melekejezile.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/40120391446.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/8899170014.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0ck3tli9e4bkd249ad4v6ejn72/nirozitipawerabokinibuso.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a468811a2---26161959144.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077483cb0ce8---majog.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/30056004963.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/81364653665.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tozubad.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/14869548877.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/22216282395.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/32988045966.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/91455603292.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ef0ca88f---10853309123.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/sowudagevuxixig.pdfIn PDF document text
    • http://fvhs1970.com/clients/876770/File/86165430028.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/faripesisegedemetapov.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c794f2b3c9---64119815781.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078f9bb2f871---47621866852.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/79217310314.pdfIn PDF document text
    • https://pecsikult.hu/files/file/gurele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=simple+meaning+of+constitutionPDF 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_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 17956 bytes
SHA-256: 1c03d8cc680e9247278e8ade99e59ac3676cdbb1c4a4227b0bbedab3a15411b5
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 10896 bytes
SHA-256: 5d528b2c8902e790fae405e2f558d681831565bc7a67ae2075b074922d9285c4

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