Malicious PDF — malware analysis report

Static analysis result for SHA-256 38534f43fdc06636…

MALICIOUS

PDF

146.4 KB Created: 2021-06-29 04:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 318e3b018a5e21dcf72971f5b2868d92 SHA-1: 944972608f5e4d15bb652b3a8d9f5e15ca6bc18a SHA-256: 38534f43fdc06636b63974395888875931c8fb48aaae87aa7438f143305a6cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://ketchas.ru/uplcv?utm_term=index+of+all+american+season+3 PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4e78201336fcd0a7359cf898ca803b6a/93650208846.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f0ea0647---53186358541.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/38614126110.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec3a58048e6b419a6d8252863967ded4/78359050584.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1890082ea---831362012.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/4092257155.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a411afe4a---vixijilubetixofibole.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa22b5a7de---bolezavanibirinurawudiput.pdfIn PDF document text
    • https://numberonerevolution.it/file/midivademotidofajok.pdfIn PDF document text
    • http://clingac.com/d/files/laruzitopibodo.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/belupedimax.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7776ca2---99550580865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc029cec2a---12047947091.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/91806847993.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/31030618200.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/katisuzakevawopenemali.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703ecd41eb6---nigasudemapigakogepowiv.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/g7v1t1h4dubkjtt9m2asvd44h6/zapus.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/gonaxelosos.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hkp8fuqd2tqn0trjmu9e782q67/sedemupogo.pdfIn PDF document text
    • https://bdata.vn/upload/files/lotuza.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db93c0b87---vikisabiduk.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jqbuj1i2qss4nsq3t58vvsfuoc/pewodixidefejuwupapevet.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/14605036208.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/67544988632.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/45826404238.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_off0001dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC09 17932 bytes
SHA-256: b251572b34e697c873d500fec367da1fd140402a36a6409700ae4da7316b3917
font_01_sfnt_off00020b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B17 10764 bytes
SHA-256: de2386e92087c300a2cb04695bfb93e3a3768921d6518330e4e2c6539e6ce6d0
font_02_sfnt_off000223d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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