Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b9a75277512dfe…

MALICIOUS

PDF

92.7 KB Created: 2021-07-05 04:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fe434bb2f29ccdd4b2047e8e66b96615 SHA-1: 86176e46f8e3affc414cb56874d16a0324e9ab7a SHA-256: 48b9a75277512dfe1a94d04ed49fa796f6958bfbf11826c212182877b0f0f7ab
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded JavaScript stream and a link farm that points to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The primary attack pattern involves luring users through a deceptive document, which then directs them to external, potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ejg42e5frk0l13303rd89m2co5/lefijokedemavupeniwosote.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca117422b---63576389044.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/63408275063.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/p91r4e4k2mdqnqa02gfmaeffa3/21100823337.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fuwopiseri.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/3a894fefc988eb65f2dc006a00dc2ac4/debisisuzewatigu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j0jv0ra4gt3rj4ajp3c3j6epsa/73685090396.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/32920340918.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rb0ti9f323th4lgrgeb3s54s2h/38159036135.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93846525667.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a580b641d99---50277510798.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ofi4odogcdjo58hvlt6etuh1jh/nozesu.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/gemaditaguwumebesepela.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b27e9ba1---fisedijirezasozab.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zoforixise.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8be38c4085f8e32559d52c89e4a22ddf/wuzawid.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/13/defulakabep.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2f5fd2c05c9d35d345654bb5899f4fb2/nelulexebawuwudag.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/movmrgb0hqdem8aoa2pv6q7294/47561550084.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/riwebarojugezitavofovelep.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c88b100f563206e0f5f017fd55ecbc1d/bajimemegoluluvutozopej.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/putopa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607619895f953---winawiduv.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/numiwowudewexezo.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/nanirat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6b0384d2---pitolup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=daycare+closing+letter+to+parents+samplePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/24c8b5fde0e6f2ccbd3f1f2870e389ea/javusimima.pdfIn PDF document text
    • 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_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16976 bytes
SHA-256: 662aecaaf36977b8acdce9856bbc0c5c3cf76e893cd6039f06116b07ec97e0bf
font_01_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C47 10832 bytes
SHA-256: 4ca7c172c05e3e588d8069886cb0c729c0ac31c3b4722555246efd439e86a500

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