Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9df3cec658f5af…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 21:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39c1f37a6a90eb3e6b8d4f60d84c1cbe SHA-1: 9d89ebf86101f7de95da161f0441b92249168dc1 SHA-256: 8f9df3cec658f5af9d9f259a36ff1d4f160e952f72a23acdd9a030268e51f5ce
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/drqeaoqodd5j9gv506m1mdljk5/jidojurexotetavofiduvez.pdf In PDF document text
    • http://stepasidemedical.ie/images/uploads/file/rugakekosa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/627177ad20dcae6b1f1a8a2ba6f5c592/mutagesivi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/vokibazadokasawepuvi.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/91764537349.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007389dd8e5---bitifojaxavowuzuwatabilod.pdfIn PDF document text
    • http://yejida.com/userfiles/file/bukebekixomo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee46d70c419---9833916548.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/30701237278.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/paviwisoluguzoju.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92964269803.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/28470452141.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/67940316456.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b1960311---63574887689.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0f9hol4116ncm5f1ohtm46qs67/20844572795.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mixenesalomome.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/64530414683.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724dd201a35---bapogojaf.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/fevigififuxenan.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021873726.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4632a3b961131a92eb392f38943a86ca/39613438880.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f53f4a4f7c4---75272624790.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/18038086871.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828ce78a02d---rewed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shape+with+9+sides+is+calledPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 17700 bytes
SHA-256: 6a3c1cd562876c51e82f344fd29e60748412ca588c162650c31aa1b1d26401da
font_02_sfnt_off000127a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 10616 bytes
SHA-256: ad32379a7639954a8b951c4505fdbdfed39e37fc93e8075086160bd8e917c4c3

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