Malicious PDF — malware analysis report

Static analysis result for SHA-256 a947922533ae399f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 19:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 426c6ba787542279545a5f269df23d2e SHA-1: 0592c76e231904be653ff37c11216284583a4603 SHA-256: a947922533ae399ff13d9b44430828f06d8079ac6d41cfacad72c0397671516b
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm with external URI references. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://milwaukee.center/userfiles/file/lobifusedasinebitiwi.pdf In PDF document text
    • http://mcutech.net/files/7838121980.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/65906058407.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71795812883.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/foxenipizofotipiripe.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/dexax.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/43138552816.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/taxotobedatuwer.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/lamadikegeran.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/12843315902.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/texexamenezarikuze.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/vorezitedawamof.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nokupomitawinovu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cafa880c870851a79d0d154a705cfd2d/59193817377.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/tiwagujabanoj.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0036248a381c3fff67cac62d535e3300/28839829149.pdfIn PDF document text
    • https://hkki.org/userfiles/files/77439521069.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/21647762389.pdfIn PDF document text
    • https://preciseenergygroup.com/media/jatabamudevaferanedak.pdfIn PDF document text
    • http://parentini.it/userfiles/files/18718745694.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/65c826f16adaec0326e6c0f063b72f33/28737807841.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/polozudajedamezibog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+exe+in+androidPDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10352 bytes
SHA-256: bd96a7b1ad406d5b5a47b955daef46ad9e0b99f6724e5547db3a5fa3d67437e5
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 18292 bytes
SHA-256: 7b64f9d2dfb18ddc7cc57c437b8e09936666fe08a405887fa2a1482b56bf1505