Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc8b82f538ddf35…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10a68e391581dd9cc14aa4bcfd597d0e SHA-1: 76d42b896e3ec9e82f8c10e7b957421d5d01ae45 SHA-256: 5dc8b82f538ddf35c2757a394f31aefc9005069e459bb83bf2d3403b5d292a84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect the user. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicates a link farm designed to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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://noble-program.site/js/ckfinder/userfiles/files/numujoluvebimigepinuzarex.pdf
    • http://hoteldanang.com/uploads/images/files/47449483867.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0881d299---37078202114.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6c638777---56537098804.pdf
    • https://dodomacnosti.net/data/file/82656281922.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h38vftbpklrepcpfhhggsimoqa/xukulokilikanowapedudena.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/33748454868.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dcbec1b03---funebororo.pdf
    • http://mxm-hosting.nl/img/editor/file/japulideduz.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5f740a06---88147474932.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/294499717.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdf
    • http://allprintusa.com/admin/images/file/76855761229.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096f96e5cc63---25073170867.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rrookkpd3nfja0u443p9pul0aa/fukogutusi.pdf
    • http://4998horo.gmmwireless.com/contents/files/nidejijifekorizes.pdf
    • http://autofulltravel.com/userfiles/files/vakemuvumapifinafufoti.pdf
    • https://fotoprint.lv/downloads/file/86143030795.pdf
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/75280348892.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12e5ed4d40---rofuxepidaj.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/96fdd85ab8050bd034c460944774c999/24299262105.pdf
    • https://amgaa.org/temp/files/4044652658.pdf
    • http://secureyun.cn/uploadfile/file///2021082320140697.pdf
    • https://peperita.it/writable/public/userfiles/file/vifipim.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff098efa---mamowibadusanor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jabra+step+wireless+earbuds+manual
    • 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_off0000d2a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16792 bytes
font_01_sfnt_off0000eab8.bin
faa8f7984c6fd88128fabce9fd40bf41062a71ab7c7c12732c897f864865d7e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 17448 bytes
font_02_sfnt_off0001183e.bin
9d5dba9e059556927bc5bd82db7ad5b85d8c9244a48bcb3efca3da9fbb39117c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 10748 bytes