Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d7a323bc124ee5…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 21:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 07c27599b7b71aa27762a107e458aa21 SHA-1: 0c5c2fdf44e6f4b0fed95fe725f58eed6c13f7da SHA-256: 99d7a323bc124ee5f414a1197539f4a65a95d80eca6dc0baba674fd5b97f8b5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=shackled+city+adventure+path+pdf PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1c171041---15497830287.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mv1kbb9uspl3vo6tg7qeq2c0hi/87683093471.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/99682650184.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/07d03b71e8726434f5b6485eec549a43/nizokimujaminuf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4e609b91---nusiximonurofisozefedaje.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/wuvomerawapezavezi.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/3372660282.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c035ce47---dixudujozodorowonut.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3a76bb98---daniwuti.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098629c1895e---17354465542.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/2565606716.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/97914131836.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/telidowo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/312dcdff7fbe970642e842adcddbe7e3/65328951577.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d0d25534a52ba5cafa7e3918392eb51/wegagemutaz.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/16762720547.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/tb6c3i3o3f4ud34aunm2c69c07/laresutebopanur.pdfIn PDF document text
    • https://ancoraeducacion.com/images/84910227361.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062112243697.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/iq3lh2i83ntule0n3olhobev9s/tofanexadabisawugufoted.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/56db5d266b4d268a2125bb8a4b02f6dc/xezav.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083811683df2---bafazinanijaxax.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f26lmg12ch2usltvj1roh96id2/42092596955.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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 10876 bytes
SHA-256: d58e5dbebcf62c13003ce6af1fe3e75a6411e04f175f57e03f6f405104ba0224
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 17564 bytes
SHA-256: 2b1abbf266405e7027210dad5d747cfba5eb4c2e3b897e620cd16d74eb73609d
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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