Malicious PDF — malware analysis report

Static analysis result for SHA-256 88906107a7b9f2c0…

MALICIOUS

PDF

103.7 KB Created: 2021-06-28 04:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6db268d9c95d7f9b85471c4c4194163e SHA-1: 5c5e4542480fe3b8ef7f5c380217a3bf0b1c503b SHA-256: 88906107a7b9f2c04fba9f5a9e1ef8660ef3a2f3a38af2bf124173edc65fe2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The presence of multiple links to potentially compromised sites supports a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://west-holding.com/userfiles/file/54959233191.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popexuk.pdfIn PDF document text
    • http://nature-revive.org/files/file/85589392610.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jvh8a56pplih97g9gc5glofrrq/lavivotiselusub.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/85855201218.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40dc7c5c07c53bee35043e6bd1151922/xoduwufudaju.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/mevuk.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wopadug.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57665ce5f---lukefedu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/96815868906.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e533321f7---dabijufupugukat.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/68820228189.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/nudavuzerunu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1fb0157a---66431143197.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9a9b3c0e---15044990753.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gotof.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609829e62af3c---13358359265.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/tifusikesesawusikisagula.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/298d4ad3807330436d286e0ea94b7484/juxogeda.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/vixevixomavisasolel.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vevuzasaj.pdfIn PDF document text
    • https://penal-garazh.ru/files/58910654930.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e54a45040e---86205352909.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2813ccf7---risosukuzugofejibawevar.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/xoxamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=west+facing+house+benefits+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 17160 bytes
SHA-256: ec7ab0ae3ec1eafae017084dde9197add4befd1c858659b99c7a3e13dd692376
font_02_sfnt_off00014167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14167 1916 bytes
SHA-256: 0ff6f9f2d28284f24b0e057d28b117f4b8502000b6bf9d387c616e5ba93780c1
font_03_sfnt_off00014a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A53 10916 bytes
SHA-256: 9f81fe64fb7134273a03a9604c4d9657c2a4a94e6eb4915525767030f801cd6d
font_04_sfnt_off0001636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636A 17256 bytes
SHA-256: 9de23283c7e6aeb5e0f65bf022c38eb092309cce4e2594b6dfb3f9469a037e33

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