Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab034e49dd56d7c…

MALICIOUS

PDF

105.5 KB Created: 2021-09-05 10:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af056aeafee25e30028bb0c4eb65edd8 SHA-1: 308deb09cfa7801fe37d221fa5b7dc0c57737784 SHA-256: cab034e49dd56d7cedb415469c6d81d75676bfb01a0157abf31c8289675f3f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of external URI heuristics and link farm patterns suggests the PDF is used to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=lifo+method+example+pdf PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0083d6fd58---wujawemu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/pijijug.pdfIn PDF document text
    • http://kag.fr/userfiles/file/tiponupitojovekodawu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/gakifem.pdfIn PDF document text
    • https://argumentua.com/i/file/bazenuladamovurenivis.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/57130657986.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/puzemijixikusumu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/98817461602.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612caf1af2d62---zujekuduzi.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/nibuzabar.pdfIn PDF document text
    • http://4bx.pl/public/file/11845646457.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/39e8518047ba37f8674c3cb1ee129fa6/xarezeturawi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba847c25d4b---pogexuvatijumoribet.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/925e4bea22a29afa555b4bd3b37cd7ca/pivutujubuzuwinituzasiti.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nasupunasuwadatikesimoka.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gameguritoramaguwejajuz.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fa0941f7d---joximufaligataxoja.pdfIn PDF document text
    • http://pololanna.com/user_img/files/28345276635.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e86d7e89d---24433075658.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/99115042736.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/23754531121.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_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 10448 bytes
SHA-256: 99cca0449358740d04689d540475afeb2037cddd9c2cd2acfefde007fc18a8b3
font_01_sfnt_off00014fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 18744 bytes
SHA-256: 9a4a3d2fb39c86413ef9afc124ec02683ed96d0b3e3b707af65758e59616b79f
font_02_sfnt_off000180aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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