Malicious PDF — malware analysis report

Static analysis result for SHA-256 8298f4662224f063…

MALICIOUS

PDF

88.8 KB Created: 2021-07-21 20:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35fd2abf53ff9300cddb9300759014dd SHA-1: 13479ed4ea83dd407dd0543b2d9b92eb00dc5e24 SHA-256: 8298f4662224f06338ce22968e857133cdb8f9a1c592b72b131fd431d032524c
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a likely attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://listapp.in/ci/userfiles/files/rirobo.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c640875b21---57642157654.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739a547a36a---76275039418.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/1393731043.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210611000028.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/3505648063.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c6f5901011a508618830faf16f7453f9/nawekeduli.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb345d995f2456f0bf6075f67021c79a/34452071257.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db143afb07---64877576373.pdfIn PDF document text
    • http://lawngo.net/fckfiles/ximejulofitiginaxi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/sujup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bab13e4ae---nebewusogizoli.pdfIn PDF document text
    • https://aedwea.com/upload/foto/1705433066.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/95049148064.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/diwuwu.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/pesuxafiwafaju.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bd255c1010df8b0530d8f6dacf1c02ba/8329127068.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/140504457917.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/40875896415.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0ls5eahpkmp7nikpr0gjomgi21/lufozerobijolapo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fdc3ceb1b65c47596598459332e1a218/voladagawusedusuwowov.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8acad17c---nipemim.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/38468080314.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f790551b3---tetejesesodarenifefir.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/zogolid.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/famavonuvexatenofaxari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=esg+procedure+for+weight+lossPDF 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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 17008 bytes
SHA-256: b9b8346f52780dad98ef25716bdb9f4425164df04215d2544a4b5b9514201b2c
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 10804 bytes
SHA-256: 24342924a2e26a0c0e6c86d1d09373ad7716d50437eb42db3f1871f024404382