Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c75e8e0f615eaf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 02:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d85ab4d2f36dbc0c11819f04a301c3d2 SHA-1: cb5316570735fb11a1935af4ffa81d3314b4be3f SHA-256: f7c75e8e0f615eafc8fd7094a991cc2c6e0a3206bb82942bda9cbde5ac68c5c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ML classifier strongly indicates maliciousness, and the presence of compromised CMS upload links further supports this. No scripts were extracted, but the document's structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=fastest+movie+download+site+free PDF link annotation
    • http://gt-outillages.fr/ressource/site-image/files/wugasevom.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorolifediv.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/sorizomufijitu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/19/file/20210919_055500_131.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kovinovetemol.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/72024390972.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ef55a8a6---75108154100.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rulunuxa.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zabotefafovizigaxurebodod.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902010017.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bukemo.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/ravurumuvatafuroxufomeg.pdfIn PDF document text
    • https://netpage.info/userfiles/file/48068366903.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wagesoxow.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/wonasonegakebudiledebe.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1c279ee444c0a4c98b7cd6d955652027/81419999189.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf0d43779---44642676685.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xugitovaxuxopes.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/lasibaduwoluxokeg.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/86679776992.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/rokawugibataguwin.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/sekiwopobagaril.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/80009726299.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tuwamanozufagavojatun.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 17348 bytes
SHA-256: 0e7ac02922c1dd70713cde1b68dc987c41abe14be072a272b7d29243057ec0a2
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10644 bytes
SHA-256: 1f408407f54f023c2662f68a0552a2ccf1c7f16af4b59b0362d8b2c5dc45771e