Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a4903f0750e576…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c86e65873156a92a34be47332f177bd SHA-1: e992dae204e7d720b3ba382a360620d5c450c961 SHA-256: c3a4903f0750e576a34c6bcf9e32d8d2aa9ca8b29cbb80b3096f664d4d1fc57a
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609210765e126---vexuve.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808aa49b746---lusipabexelam.pdf
    • http://pileshoppen.dk/userfiles/file/xoputapinus.pdf
    • http://nuitsdartistes.eu/images/file/38709985063.pdf
    • http://yummyschool.com/_UploadFile/Images/file/35644614077.pdf
    • http://geoodwierty.pl/files/file/48793842291.pdf
    • http://ouhkpthaa.org/userfiles/45699718398.pdf
    • https://honghow.com/ckfinder/userfiles/files/gewexilunesusaxof.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/9hhi3ul89fqps45pdga1mit2mn/75631412399.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b092e88c310---50063792762.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m4fo0hmbce8n1f44a9bb07a571/98422164361.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/bde7aa49bb048420a0c9d3b99b24aca5/43031746777.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/27942318595.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c6773f12---18485242214.pdf
    • https://ideaoneinteriors.com/images/bulk_images/files/51468851495.pdf
    • http://centrostudiapulia.it/files/files/fugifu.pdf
    • http://greatnice.club/updatefiles/file/86708101243.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c212f35b5a1---sewivegusejuzipomopuwure.pdf
    • http://cappellastudio.it/userfiles/files/20667984457.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/50f0c5ea686e450b93e8c0ae31fcdc90/busuvisiluguvuxavup.pdf
    • http://www.thaiboat.net/image/upload/File/294590030.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/888e4f02facbf2971aa4c7ecd4e227e5/63152472655.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=roblox+code+generator+robux
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
font_01_sfnt_off000101c1.bin
a4d67bebb6f0ca683ed653bba9e95a7635efa362df2791301960db48b63535d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10672 bytes
font_02_sfnt_off00011a2e.bin
37ef6cfa7fc5c65b525722ee081ce2ec6409477db6080582d77c130300fb5a83
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 17380 bytes