Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e98fd8b5bf12d71…

MALICIOUS

PDF

85.5 KB Created: 2021-07-13 17:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 698d0751cc1f16bfd046893b14c949e6 SHA-1: 4d5803e6bf5ced13dd1fef5eef1c6cc2024f385a SHA-256: 8e98fd8b5bf12d7107109d935f0f861821dd568801a186fd7303ead62e9009be
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a054185fe3091726943f9c32548046ee/11778452549.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b459b229ccb---3053400713.pdf
    • https://iva-vietnam.com/userfiles/file/bivagugosagonojivatewab.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/20187678741.pdf
    • http://a-kamen.com/userfiles/file/85670393251.pdf
    • http://partnerplus30.ru/images/fornews/files/81713269480.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ukdekmbthklasqm3cpb3essh5k/19581790555.pdf
    • http://machinegroup.ru/img/outer/files/10225649941.pdf
    • https://agmatbaa.com/upload/files/85052534640.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/772a3f88947f1199dccdf8f3cd8371ab/jikukufixinotuborak.pdf
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/39027865378.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/kuxupawudanebofu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160985f7aee633---21664628330.pdf
    • http://fitviewer.biz/files/file/16931391661.pdf
    • https://ideylia.fr/uploads/file/39323565394.pdf
    • http://sk-massimo.com/js/upload/files/fewewizakukoxupaxatunozuf.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/299c83b8aa6fa708d294fae08ccac793/nakutozevitalafukuragon.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c706a2ec02---44220479535.pdf
    • https://bataretak.com/img/files/file/14277806643.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00b01417c---tudexebofademorejuvulekaz.pdf
    • http://bscartridge.com/pic/sojuvikogotogadi.pdf
    • http://lutechmed.com/Images_upload/files/53861704956.pdf
    • http://rld-carbon.ru/file/sewolevuxebixonijaxokix.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a9a4a1f5---59309717244.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/noderidowedog.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/67559921919.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=called+once+crossword
    • 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_off0000ed06.bin
cf881928c4d77ada098b7f34a63afb855823d2cb80beb8af5e312c4bb61d4035
pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 10288 bytes
font_01_sfnt_off0001045b.bin
39ae57ba0573244f7bebd5f78eafb5e5a8a70d11b61e029e5b425d34174b9515
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 17164 bytes
font_02_sfnt_off000130f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 16792 bytes