Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6882670d72e577…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 01:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dce4c1831a0265143e363f1fccaa87d4 SHA-1: 0f2c2f68ad3f02c55e78d96cfdf6eead62b81503 SHA-256: 4c6882670d72e5776c526ef8cdccb3cee7b50225df5dac3fd492c5200dd42ae0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spheresignal.com/app/webroot/userfiles/files/64138605064.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/47573246468.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0v3o1p61ujca2j2jcljreu23s2/88206664952.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b960d40ca88f73f7475192e8892446dc/64315038985.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5e3lpls5rfgh83gus6qlg8k7bl/66040573311.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/8d50fcb5c51881ce10bda238112b9d63/22518815095.pdf
    • https://aslimitada.com/userfiles/file/32746173727.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c64eab7fa2fce566e0bf1d68a84bfc5/rifirukifovarewusev.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0b7b86ac---48059915611.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075462976596---28575368769.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106221153309755.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nh5q0jj3blmsetgmflq4rs076/jojusexisakawat.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3129cdb30a701f2b3567d5cfddfc3344/40179618474.pdf
    • https://samngaimarble.com/html_upload/file/puzusiketefasaj.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775da1a2477---sovigejapawol.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/23646020819.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e56257m045c7j0idvnb5kf4hg1/76406000964.pdf
    • http://s2ipower.com/survey/userfiles/files/54877184812.pdf
    • https://bouveau-consulting.com/userfiles/file/kosupebimobak.pdf
    • https://creteservices.com/FCKeditor/userimages/file/fomebevibepe.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6707f36e37376ac54554243921f1c59f/jigofik.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/jugotev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=spins+pirate+kings+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
font_01_sfnt_off0000ff53.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16192 bytes
font_02_sfnt_off000114db.bin
30e549c42441048f05ac69e5afa8af9d53c7562d90e68c83378d9467b850cb96
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 17676 bytes
font_03_sfnt_off0001430c.bin
e8de08b1c0c1e6463b0acee992377114135ef82fbbea0b4f27e8b4453345dbd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1430C 10536 bytes