Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a84d7635d215b8…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d877994145eedd6d390795b6cb45bc40 SHA-1: 62893d9879e43bc70709db3cb427dfc0d09af0c4 SHA-256: 95a84d7635d215b8115cff43ec4303eec830561dd1e43538f237d2d650f03c28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. Multiple URLs hosted on compromised or disposable domains were extracted, likely serving as part of the lure or a secondary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/66558b7e0f9ad0a9b79a3c26c3a958f4/pibize.pdf In PDF document text
    • http://anhopphat.com/uploads/files/vefuxewimurakuvabepukob.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8ebd1fa124ff9d18c0674430b73c5666/21032249986.pdfIn PDF document text
    • https://preciseenergygroup.com/media/dufujapigavides.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c111dce54---70442536802.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e206eb36125b7a132fdb0e7fd0ef9a0e/mitelobewawukeze.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/97546413875.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/5204624668.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/35007733506.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e9bc4a6cf4304ea7d26abd0bc63570c4/26888611783.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687205a105c1aba64a752f45d67256f0/xutesofapatu.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/14983799440.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161844334553.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdb0c2927---rawuz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/belanejolot.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/47611121418.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b890f54ca97---jisupoxigoz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/emrgft9f1b435cial3rm7j148c/fazatuvuwipujuj.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/tisedodafove.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/fojupidelupobamizafod.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1de4e4b60d301a40ba73409778074ad1/30483662279.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/voxawoperoletunemibeni.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kunivobezanosapanexi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/sli7t91le3jnopeqfl2spi2n4m/67660212116.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/f0e1705f8ab1d2788982d75cf0c18de5/79072418511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=c%23+is+datetimePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ccc2e66fee6f3f1544c09682bdef4a3b/fazamiromekaw.pdfIn PDF document text
    • 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_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 17016 bytes
SHA-256: d9d1ab500365bb6da0ad9d3195eb8f6930820ad3108f550a8871940406e44104
font_01_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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