Malicious PDF — malware analysis report

Static analysis result for SHA-256 4470f5f8a05cced2…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 13:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c3fd17a7f5e00ffafb70ebc11423b7ab SHA-1: e3d9891df92ce919b42f3555876175dd9366a4e2 SHA-256: 4470f5f8a05cced23dae2da21bad55c7d486bc7cf4e92596c104590c2a405560
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of multiple compromised CMS upload links reinforces this. The document's purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/83b76ea07edb88f39db21afeed62f54c/77520926523.pdf In PDF document text
    • https://rivaflo-south.in/userfiles/files/9914891088.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/34585290415.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/87903025181.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/30857866861.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e54fphkjfcgaus4l20ea6ku9a7/masokidinusuzaruruv.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6af4c84a8---79443188517.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609923e611add---mekulabawuvanogarotu.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/jumubelowadek.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/284c4809c129f41289c2d2c8bd9f25b2/34810202181.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c5992db3---42076404317.pdfIn PDF document text
    • https://music-group-store.com/upload/files/8535868557.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s4bgqcseo2bdeop867l8ursufv/xewuf.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/5558033322.pdfIn PDF document text
    • https://airshow-bg.com/file/xaziwavupil.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/99912030519.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/10487000556.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160878de448a94---fanawibolatata.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/83216124387.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/mazojuxofejewalopet.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/91162518004.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ee9f3c49bf330a27d979233af125a163/manul.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098177c8f0---44395398529.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/ae060c9273051b0f9a575e8ad5165657/labisubupolazuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=client+testimonial+examplesPDF 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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10448 bytes
SHA-256: 3019912331f53f739ebed85ab8e30226d9c58f52188a7b67ffb9b98ba0559c02
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 17152 bytes
SHA-256: 6291a03533420b4a15ce3fa065a4c5ae2470d245eea0e656b45ae3a389bf2038
font_02_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1