Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c76f90112f2bf24…

MALICIOUS

PDF

107.6 KB Created: 2021-06-25 23:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea6460eb137448b0791efd71d183f9e5 SHA-1: 6d93612cdcdcd2038f7a5e327992eb1730c4af51 SHA-256: 5c76f90112f2bf249063adde088fa40a8163aaa8716fe5d093358a41e6618ee4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608070cd793e1---musaliwimapedate.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ddb0366d---36365490424.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/s7t2d35j4tugrj4t93fe30abtq/70743346031.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fcd9098fe985782a115efc442e8100b6/82774762212.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eej564bj559d35m5vh77k6c987/50937122873.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51a50ed9c---pusomopamaronetupa.pdf
    • http://ackerviewguesthouse.com/userfiles/file/83851166098.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5799166568bc387527c5235219fab9e3/tavogiwazatupivomamupeteb.pdf
    • http://arisutour.com/ckupload/files/10556300793.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1229d74d---66497620236.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77c0e7a2---54240699652.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r0idibj6266va1kjpn4u36dg0t/tewama.pdf
    • http://musikpark-live.de/userfiles/file/jitodudexagirekik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078facb9c03b---88304548299.pdf
    • https://okazdedziecko.pl/_files/Media/file/zeluteje.pdf
    • http://kpotplace.com/uploads/files/9444968254.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c22bde72601---kesepesafesen.pdf
    • http://chinoboxingclub.com/clients/36032/File/feviw.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/wisuf.pdf
    • http://elitvorota.ru/f/file/4439689237.pdf
    • http://aryajob.com/user_upload/file/nuganopuvilex.pdf
    • http://otvorene-srdce.sk/userfiles/file/96116041299.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=water+soluble+synthetic+polymer
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 16792 bytes
font_01_sfnt_off0001551d.bin
58df0b1f0d858836956faeb1a84a663c4f92221c6d81e05513186229c58db5a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1551D 19540 bytes
font_02_sfnt_off000186b5.bin
1d68cf504632d23ffe0cda3a4e99cdb69dd4f319f52c98104dfb34af9c9098c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x186B5 10984 bytes