Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b2908c5ac9ddc9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 19:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae5273a52f617abacdd56a7f5ca738f4 SHA-1: 91e8d18fc8116a98f7382a99d79c8cd0762a6fee SHA-256: 02b2908c5ac9ddc903886e81a6e9ada50556d43dc673038ecf201fb0b0855c10
96 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 CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/edf79db3236b8e88388626332dd9a4af/gubatiwuro.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8c4a356c---buwedesejagalokoto.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210914090621.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lidufigakute.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lasorujedewukebi.pdfIn PDF document text
    • http://wohntraumgmbh.at/54820366574.pdfIn PDF document text
    • http://agama-rc.com/upload/files/70165039254.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/51441386755.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/vuxujatozapamube.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab91a31688---gedaxa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f9584bc---39185261961.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/ribiwakasaziririjazuke.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/divexivemololosodilo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/96640024787.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/pagadokozetugonopaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=poco+f2+pro+update+miui+12PDF 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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 17680 bytes
SHA-256: 8206c7aac0ddc655a9b61fbc81ca0a804d4e589fd3d1942e60b463bc1e635c6a
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10736 bytes
SHA-256: b339b9a06bb0c0b7d5ac6feea08649a0a97691a554e274f7e56da5e1aaf1906f
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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