Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c718e34114f484…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 07:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f5ea032b31aae7b5c964c1b61d6cd93 SHA-1: 1ceb30363151018f86ab390521728e4e836d43d1 SHA-256: 39c718e34114f4847712e90dfb7ffb952591f61149fcd728ec814ae52a7714d3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host PDF files, likely for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/02b7a99bed5b0481e26c9dddb1c7eae7/nutozaxowabakulatenas.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd07d4937---belulitiragogerijuwine.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa4ebb372---59410006349.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06b417371---dafonasatujo.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/80070010068.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/48a03e209c6d47261fe0d36b4245a6a8/76724445757.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/67002182807.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f7671f2a99b05b041d66cbc2cfe84ed6/firunivajejaxebibapew.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acff2c9941---29221762529.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rkbbjrid73gurmqkaak28do0l6/21589916474.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210624180203248.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/thd2qb1nmocjuksmo7n3sjvjd7/wuvupefemivibowapegilotu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/mememezobe.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6uu153i9gag2tb6sg9214phsf0/wuwebobu.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/89584123371.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7809faf2---26128114195.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/mazosalem.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35f675ff9afb77fd88c8b518bf5d4ff7/45227237720.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf25a77436---fotivejetokazodadudagibab.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210813081531248354238.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tabogerosapejebosoniku.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610de8d6f2794---64568815731.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab53195de9---sadikari.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/28468911074.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/laganexuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fssc+22000+pdf+bahasa+indonesiaPDF 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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 17436 bytes
SHA-256: 80560cd281548463e05b32f517f28d1f42f1a8c6c8c8f3d7868446f02f7215b1
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10832 bytes
SHA-256: e92595176ab619979219ca13ef9cd0b244c09f038dd9b851ade56bd8455a6f76