Malicious PDF — malware analysis report

Static analysis result for SHA-256 4649b1eed143232d…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 17:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0449386ff0e957c79f492f024d9cc848 SHA-1: 10d87f79b337e47c83d70198e9e5d43243a6dcfc SHA-256: 4649b1eed143232db8e86638e07d33ba4860df5c663fe3f4b8ff57e1362b44e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919db4a1ae---moxulasowiteb.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3f3c012a135d5052a70a5676a45726dd/vipisixodemule.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0d880564---gomamiwiwefusigetibi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210625133144_h99f3f.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074834a2c7b8---80869037961.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/t1narbdpghp18pjk0hfn361uh3/12175435080.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f3d4b9abce467a41c289a0b9e95141a7/tivaz.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/6931751578.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa762cb1908---zujuwakef.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/79bc7776b79891730e61f6dbfed334c2/newixixewinagiwez.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94c8395b7---82908993401.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/91474814110.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085599345f---11377796562.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459cd55428---zafewibiju.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ub1o0g4986dpdc8dr4sm6ji5q9/32314781966.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ea3a6ef0---lewusufixofulajon.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c5b17aa66---97624336152.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-8/20210508081220215608.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/13728924971.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5e7861f2d49a30b2bf73e446128ce58b/xepuz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf4e72010---93972294974.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/sopikidelap.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/morejaves.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/80086868916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jobs+that+can+be+done+by+robotsPDF 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_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 10572 bytes
SHA-256: 32f2d26b031f4aa8504ae9627c881ab796ffa900f31a9fc0a7767fa36bd27e97
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 17392 bytes
SHA-256: 1ed4310d02bca5381a495c2b3d1e386c8c05db9a90b419223ae8cf181ea8aafc