Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96502ccc93f9b8f…

MALICIOUS

PDF

117.5 KB Created: 2021-07-18 16:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9e3e753c8356d4cf4176c1b797532741 SHA-1: 40715b37dffa39ec82f0b2cd7fdd631c639f9a5b SHA-256: a96502ccc93f9b8f0a5a0fb5b98240d12a732b5fe7f3c17238046e294d2d70a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6581c5d29---21467676997.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d274baaa---timesefiboj.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48cc6f260---kujavux.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/10755182156.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/019d46c1c9c7e5d5c0f21c0404f4bd58/rexebokofulenowimagusel.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd469d47e7---63612760492.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23c1c4c6a---pavevajuwijov.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/33586292125.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d38a4c2e---pidojuvuwaxulabimitofu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ed3bdab35dee0cbca9183d386d8f4c51/38447640054.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e4d17fe996d912bd0af650d70f420438/52474235025.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e261853ff---40431014616.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052800225170554.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rigufef.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/53567699546.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/merigediwupipokifogo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953a2d6d93d---94249565890.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fabp4uff3tq59744rdjii390fq/6575533291.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/64445880286.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/13424747745.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3424ede4---mopatutiritexufadogi.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/75305639553.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/23481421019.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/21714604113.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gugal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=black+ops+3+zombies+custom+maps+pcPDF 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_off00016812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16812 17948 bytes
SHA-256: 776a9c9d8748f7c4540d77a3a774f8e65b18c32d175633e9df3faf8eebfd40ab
font_01_sfnt_off0001973a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1973A 10948 bytes
SHA-256: 30b018f9b747a4f695a77a622507f2b47707d93781acfc922e5ed84292dc97ca
font_02_sfnt_off0001b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1