Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b4b0ebeb6ff046…

MALICIOUS

PDF

92.9 KB Created: 2021-07-17 23:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4ee2878c76c8730d65315d8f31885284 SHA-1: c8e7a6cfe9d8bbdc083a2e96c8121eb2cf9b9e93 SHA-256: d2b4b0ebeb6ff046c1346aee681d60a92413a64f150348266136ada2ca4968eb
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The PDF's structure and the presence of numerous links suggest an attempt to obscure the true destination or to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/90d38ada9d9c6eafc6a0449202196398/fewoponisiwinen.pdf In PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/nefofedupusipigizapelodan.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc670969572---vufamilutojodidiwudavobur.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/37417145932.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v175fjkb06avk77arbis0d7no8/wotegexepikejusipok.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/zusej.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xujineruboperizezew.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0033cb379---45527537906.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/puvuso.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/74403284524.pdfIn PDF document text
    • http://wenxuezj.com/images/File/82954471424.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/92403641865.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bcb092d20---kolotovepe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f2d9271eb---4181829871.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fuduvufabevek.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/419b5a9bb43eacd3bfdc250b5d47b675/basudiputononorarukofu.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/rizolakapijumekubekezo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5ae05d20a---bubolifapinagevuzivas.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b793e12a01---logutivi.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/46327238711.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a6b19930---96746058534.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/lonevodusur.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/zosakavadawesivurerugivuk.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16092103421c8e---85802924909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hotel+crans+montana+bookingPDF 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_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 17632 bytes
SHA-256: 1bd11bcf3a56ca758662dfad6baa721b8a7ed30da45f13f4ec1870094504c10c
font_01_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 10796 bytes
SHA-256: 25b610b093f0091538358ce3c54924e98ce6bef2f3ecd7b22e82ef971120e751