Malicious PDF — malware analysis report

Static analysis result for SHA-256 266b6a872b4f6c26…

MALICIOUS

PDF

101.6 KB Created: 2021-07-03 12:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d4051c96e36fbe766cd9ffbf42f2439 SHA-1: 46e2e3dd0317ca95b68ebcb0cc40010558ecf647 SHA-256: 266b6a872b4f6c2653c359a82fade0f6df53d2565269f2c38a459dfe5fd34f4d
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://mp-hd.de/data/aktualnosci_imgs/file/febovakowuwuretavoteripa.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/pufivizudamaf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/94s2n1gi066g4avbd0nggu381u/31862858117.pdfIn PDF document text
    • http://iphysiology.ru/upload/81569948916.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/sugeredusexar.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b236eb9aaed---18881728776.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/8129663959.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7t0frn3lkkuare2gg51q6p40o0/teruwupesusofot.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/witisi.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/97baabc0c940003c660199c526b4e49b/puwexa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a5ba908e870ee49a953919f76af3f67c/bodapukelog.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086862bb13f3---robibefureguxoxil.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f8f2620d---87651913057.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gafexasuwolivapesir.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juwetogasodeb.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zozunapetute.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/21065365649.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/negesobadovabusoxajuteweb.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ddba74468---nazumabavafom.pdfIn PDF document text
    • https://susta.vn/userfiles/file/dirot.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077890eccc81---nefavurir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+man%27s+guide+to+a+woman+pdf+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000103ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103AC 17804 bytes
SHA-256: d177d82c429acfc082d255bc7bbe928df7f5c3c89c53ec31b4bb2fec4617c087
font_00_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 11028 bytes
SHA-256: 9a0058a2c0d803db4b1cc54da84f9d47c2b067f944648b867bb774a3af31d28c
font_03_sfnt_off000138d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000150e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E5 23084 bytes
SHA-256: 491111c63efde555f5269072e8b8aaaba756474029a770b6f0a01fba60025970