Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa108d5a5dffa54b…

MALICIOUS

PDF

82.6 KB Created: 2021-07-03 06:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2520f63a4431eee1e3d80d74efb2001 SHA-1: 7b21e86ce198ced217dfd7b17335d7ced68dd925 SHA-256: fa108d5a5dffa54b335c4c9eb673177e37465a42758103487857fe40cf5422de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=tv+all+channel+apk
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5e75c16db9b7a013ca9d66d7dc2c72bb/52158410146.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072323718aa7---24508538133.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d7il3hvleopsga275s1c5do4tm/piwowabokofozax.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c49dda7e5200bdc5786a911e615de8c4/26822349507.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d0ae3c187bae640b312d7cccc513f8f9/84614069241.pdf
    • http://capital96.com/userfiles/file/7912377312.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd538f20b---531584423.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5su66cnde3im3sphjhht4oorta/xegunifatotabowesulamizo.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/guzokujeferotakunefatinu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795dfbe984a---navumoremulapanofuxo.pdf
    • http://zuche0551.com/upload/file/5466001133.pdf
    • http://erbaytag.com/resimler/files/78410210117.pdf
    • http://birnagarcollege.in/userfiles/file/30781223314.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf538bc299---puvitux.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210604_16A6594E528301A7.pdf
    • http://szyuangang.com/UserFiles/file///tovaxa.pdf
    • http://kstarsmall.net/userfiles/file///33336849891.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/q74d9aojgnlfsfj4v3c66vkdlc/wuwomagomefelopimuwejo.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9d2f56ce7e40fab6e6f4d9a18402ccd2/99107631806.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082638ff277c---xusurefapirezalovoli.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e24b11b4be1e008f2feec8e582d222ed/bexoxivizexadaxotisowepos.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d53222419b8544db7b2c4af2354a8370/48768006153.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/546f353c4f473b1e0404d310d527ef0b/27378870508.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e597200ae7---kifikinejitojira.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c030996fd61---8195911262.pdf
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/goloduvefitesusig.pdf
    • 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_off0000e0af.bin
40b55e4ae7c927e322893ee247eebbe38740e958ce07009f8643b2c3138b1c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 17656 bytes
font_01_sfnt_off00010efe.bin
c91af0c8cccda2b451a4f2e69a8adca95a3b93969e77982018b73cda33c127a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 10016 bytes
font_02_sfnt_off00012530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 16792 bytes