Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7feb732b7e48a40…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 05:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad43c573e167588f856a1b5e995cf736 SHA-1: 4a0e466c3c746eef27020498df0c49641c9ae67a SHA-256: e7feb732b7e48a40b308b7dce1fedad09b75ccd4dae3ecd6dc573711d4681462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/pafiduxivumuvewuzejam.pdf In PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/mepebugatuxofej.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/72278677286.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/rujebasoturof.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/efc21b8bb16c2eae73b2365c650482be/vapenekejozalusitebem.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130340fdbe3d---72896711829.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/10084120299.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/27394386300.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909040633.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903233148.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/raralaxifomurirezubof.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/450790852.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56026627726.pdfIn PDF document text
    • http://4bx.pl/public/file/62781734581.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/52047795115.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/q0qoknjbas5lef93tprpsu8vn1/kalenoniwixoraginiliber.pdfIn PDF document text
    • https://umutfm.com/resimler/files/42288824900.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/20822178980.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fisikifakakogidin.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xinoreteminawun.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/81077864375.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/30920937057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=jazz+fm+app+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10264 bytes
SHA-256: b2949872cf0c26b7643773f61cb0a385d73e798583621f38f1c050396a24599c
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 17748 bytes
SHA-256: 9370811cfe6f097b7263d4534ff048a342a448f2627b1fc488a8f8e1ece63a85