Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb1fc87b223d53a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 10:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f6f111984287bc63c03be48f37692fa SHA-1: 7b59373cd8417c3130bdc3dab82dec4d95de2162 SHA-256: 6bb1fc87b223d53a07f8b7f5b4f2c3476232eada9938aeae10c81ae9c116aab2
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer volume and nature of the URLs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lnaixi.com/userfiles/file/20210911123615_355278908.pdf In PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/6125879261.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ba467d90b5db727c1d4f32455ba00e6a/wazegibax.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d649c4937c---muxiloburuxupudominanet.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sobadafigazilenoberuro.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/dopivelazubojikogez.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496ff22ec---gipopasule.pdfIn PDF document text
    • https://ewt.cz/res/file/15369125366.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/nasopanukodubegafipirese.pdfIn PDF document text
    • http://goref.ru/files/file/wakofuxitapad.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7c9ec863a0cb3c30d063e1fa54c1fa2a/fapezejedujele.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907165738.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogibulozix.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/misurabasub.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/38901735627.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090508528672.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109080129596615.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/bugizuwoganevegar.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/midawimimubid.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/deforitajojoje.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1c91bf49d52946c1141e53d4fec6c802/duvuvagefalarepaduge.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/piwiziwabajuvuxuxexagu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613115876f0b1---36216470429.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161389b2131897---jemavetumafunoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=american+horror+story+season+4+watchPDF 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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 10708 bytes
SHA-256: e9f43a945f55f1aed0db07e9d1e866de38c8753b0c1d3f18f616b1474292c702
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16852 bytes
SHA-256: 05c99cb92def64f48206976a7a75fb5557699a60f8f5dd26c85384506804cb0a

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