Malicious PDF — malware analysis report

Static analysis result for SHA-256 5429f50ecc902f7d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 23:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45b818f49ec9b775ca464639ee99a59b SHA-1: 62483c9955e4fad8cdb52d7dd048127906bb4be9 SHA-256: 5429f50ecc902f7d2c9a33302234ff6744e5a29fbc662cf814c17b8a05aea31b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file likely serves as a lure to direct users to these compromised sites, which may host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ksnjl.com/userfiles/files/sabikiwoga.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139061062b03---67245091732.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/93548231435.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/8706203237.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/50298589658.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8c02ead9---vokozuxopawakedamu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613529f3e74b0---puxeburomemubifufawakeb.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hrs7ldg4i00nfllgb7uq5mm6jh/kekasurakabojozomu.pdfIn PDF document text
    • http://thongthien.vn/upload/files/97176466195.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7a322629---23109054562.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374509eb6dc---xesovabolinanedofodinug.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pipilunomibadaxupopod.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109051400248038.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/503173027.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/93822753369.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/rixejuz.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/582974827.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/kenubozenu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/vamugeridus.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fasabawekufimelepesevu.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/97862595692.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/kurelejo.pdfIn PDF document text
    • http://tecksco.com/upload/files/jevubibutus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ios+idle+gamesPDF 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_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 17036 bytes
SHA-256: b1bf48ecf33fa2de3dae7f5613229164baef1e6ccc5f4bf0a3ab0e266d93dbf7
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 10240 bytes
SHA-256: b5c140c2cc08dd150d73c1b372ef04143e3861742d478dd75b9168308ac59096

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