Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fd76b6dedd8719…

MALICIOUS

PDF

111.2 KB Created: 2021-09-03 10:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ed7088969308b4c8fc37c8f9a4efe6e SHA-1: e1ab0384ed60e187fda9b7918dab68241dae3dfa SHA-256: a9fd76b6dedd87192555b4cc9a7609b2a73fb243b545df12ad3fa5fe02c05c26
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 used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d0adb378---juliv.pdf In PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/20716783179.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4c167d6e6c58ff8d2b2a9542cdd5b09/suratolusapekibakazoseno.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/7577923215.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/47812823307.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/be080b1a50014a0c08c8a247bcf52628/32051622789.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6999f7dc---51626419320.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/37130575019.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a4608928f36bdf7211eec36a6eafb4bb/20377106017.pdfIn PDF document text
    • http://samtle.net/ckupload/files/82518020745.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6eeb6c9---limekaludipiliso.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/5224190783.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a394c12c76d---wejiwogaligexovewavekujup.pdfIn PDF document text
    • https://micsys.in/userfiles/file/692649364.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1clikpri3adk25ndgl1q5m0g77/loxawowuvanajuba.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/96750494025.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f385e195e---kilagosasobazariwam.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/27425349357.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0adfadc8f599941747f334d632402aef/25439582679.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f74da48edfb824e096b089ca7b535af2/14231602727.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xebovepexonu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/50043551099.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/21026929611.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/5448646416.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/58991939888.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3bb921dcc1e2cfdc0bf5836c3b628ad9/tuxurojuwabevax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=genitive+case+pdf+exercisesPDF 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_off00014879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14879 20504 bytes
SHA-256: 7d078dab99a753d5a9c66f84fdc325d8bd83d74a482357042fa8555d1753274c
font_01_sfnt_off00017e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19670 10656 bytes
SHA-256: 59e2f5025b7c6e26bf812ff502c3f1948af12173de23933a39431586b9166cfc