Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc8513006a2c52b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-29 12:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e3509d99a1d8df727f6559f84300f540 SHA-1: 3ec614e1f35aca2a48c15edd5c4bfa4aef6ffafe SHA-256: 6dc8513006a2c52b1ec2d583472652f92ab0de606aad4a807e0031b7de961eb8
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=the+name+of+this+book+is+secret+read+online+free PDF link annotation
    • http://amkchem.com/upload/files/11968930561.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/35516633944.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384a93dc6b2---tuvagolakaziwemivus.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210918113222978023hjs3x4.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/94591490546.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/65063727192.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/funalizado.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/48149441441.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/66676252027.pdfIn PDF document text
    • http://agilesolutions.in/uploads/giwitakapumun.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/5884747764.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/41076944528.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/todirix.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/15887176687.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/9169636976.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/kinavidumag.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbd9d87d42---62254678131.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16151865d0a4b8---31745640258.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41866649489.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a602fb5a---xovakukami.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/26146741367.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/dejemanuzasodexofutan.pdfIn PDF document text
    • http://strap.sk/uploads/file/87823501638.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/rejanuminidexim.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/66378281078.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_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 19364 bytes
SHA-256: b6f0e5c31b65e8aecf7006dcef3c7d4d7353fc6e846e9f93c5379be2249b3a89
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10936 bytes
SHA-256: 056d31b68253d7a8f308d6bbeb1acbd09f9bb9e8b6794d118d2e4b1095ce9a0a

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