Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec16dd8d664fa7c…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 10:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3b6436a220908af564ef9d119faf286a SHA-1: bfcd27cb2339296e907f1ad18963f9f708bc7170 SHA-256: aec16dd8d664fa7c6cc42525e9580f665b6b56ae7ce8d501a5b6d4b7588bd0ab
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external URIs, many hosted on compromised CMS upload directories. These links likely serve as a link farm to direct users to malicious websites for phishing or further payload delivery. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=timber+to+steel+beam+connections PDF link annotation
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f569d9f5f---vexotanomefubonuru.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f055a5e880---jivobujipodekupu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tujenimidojipuk.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/41608986876.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7241475ca4dc77fdaa404a7551fa553e/89390195552.pdfIn PDF document text
    • https://nevisnews.com/userfiles/rurowatebugevuxejuzipak.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mikisizukadapi.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/thiejg4gl0bqu5i4odg6lep3s3/50556219788.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/23251653816.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97ef81d30---jeroxodedovapipu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87634369682.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b880123b4---17385659000.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/31888383794.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607859012947e---somutupu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ece39b6e---bewiruwojodoligavate.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/aki8dbl8f0hp9s9gua6akgi29ive5kr4/25791456209.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a874665294a---paxokodojokevozogovapexa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a7d7e9a1---36933352908.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/710e96cdc16cd4b8e5879f14b8c4e992/rokopezojikoxis.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/44550570756.pdfIn PDF document text
    • https://tipresentoio.it/images/file/90401459104.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fr852adqlo5cdmqu2vp11sjeg1/nelimujujinud.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271552202295.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e499725a---48154115211.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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16628 bytes
SHA-256: 819a6167402ef2f9eec4478d94b921973e3c63b982baa616f7f1edc4bee89907
font_02_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 10492 bytes
SHA-256: f2822b918c17a5f2ba7024bc62d8cf45008750c555698a4b6979621eb0d27c8c