Malicious PDF — malware analysis report

Static analysis result for SHA-256 956ce4f5656e18db…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 04:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fbe5a63f6b0feaca9016656b5965d1e5 SHA-1: 0a912115cff07c95ce6c35b01a7bd0636160e12b SHA-256: 956ce4f5656e18db24ddc37f48eaad7f233924a02b8b0066d2778d463591554a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f88b623dfa4ab5e33a7e131f90ac25b9/xisutukazisafidip.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9505fa91cb---24696618066.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e4e14a1dde040b8cc8d3c56013667943/zijusumebesesuzu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae29f7a779---39344177423.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/puzemadevikelesesobi.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/87238547599.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dizavokuzelorokifom.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zosib.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/99251484910.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c649aa97d---48750986608.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe8e38c34---4996785039.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608165f30f20e---25107353539.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/83ca8c2c08c2ce0f1025972a33ead9a8/vasopofimenalavutore.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ea2tovd4v1mvjc298afslraks7/bunigavox.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/novodolepinixulu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tvao0ignbnvoa5vki2m81ffq99/tufezemuvujusetanoxis.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/34010293024.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609123246.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c1770662---15344056615.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf84fe489c---tutixudixob.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nukutam.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pituzokifa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e196830d1---41205925248.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/4258c8dcakk3pao171lqc4lsr5/korokoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ious+suffix+wordsPDF 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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16912 bytes
SHA-256: ee209ec00d53a62849436dfb4463d9a37a26c5d735909959fa6c8f74a72835b8
font_01_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 10044 bytes
SHA-256: d6432b2b0ebc672e7b69f1d670c62ae76117b837eb14ea385d72105dda214cd1
font_02_sfnt_off00012b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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