Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda9ae925cfb2aec…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 13:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 541d6e4373efb94703cfd53ce21fc23a SHA-1: 60b2788c7815dc8b91e30677610e008d5e64a6fe SHA-256: dda9ae925cfb2aec6ca0ef49503918e39e0f2e199fa2cab2132f71d8e4454e17
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=hotel+california+piano+pdf PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba0562a1---vogowu.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/46315448778.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417e26f295---mofasexazaburowezama.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912163816148697.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/46495630325.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/91183428018.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/15810879982.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9c9379d5---78554853325.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/8491853722.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/77447281200.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/37161222806.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/rawapodo.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/dipuni.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gusiwuxasov.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/7062262344.pdfIn PDF document text
    • http://samtekelektrik.com/files/96466119355.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613211ff70260---46368917550.pdfIn PDF document text
    • https://linardi.ru/files/file/kuwobixaxafo.pdfIn PDF document text
    • https://hoalavender.net/upload/files/vazabiribifilonororog.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370b90efb54---26664585255.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_off0000bf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9D 15856 bytes
SHA-256: 47aea81bb3001394552af5fcfae7d27dfb05d3df1d6bc7de862e139601d561fc
font_01_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 10436 bytes
SHA-256: af8283f15c8ab1f7715f5d6934a4da47d73584a99786dbcea314107c6dbf49c4