Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dc776a1b785317…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 00:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bea400a81228a83a66f6ec3db261e0ab SHA-1: 319d6b5282dbcb3aebb54d3c4f411eb8133d750a SHA-256: 88dc776a1b7853178efc922bb8f0299a4992c0266f6c1c771c656c70a7b70408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e8ea4d82f4a192399ea648f60bf040e/zimugenagenifirunikageku.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533028a1bd---74610618616.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/nurireburogalibenojinap.pdfIn PDF document text
    • https://loctra.net/userfiles/file/favofel.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/90373792551.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cf861f979---5758393742.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d795e45471---71749873558.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/32328622536.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/fovisod.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/samorivadem.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35e6b064---rugelubanesofitag.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e841a0b33e1---tovinojutufapoxeja.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/47205889541.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/55567018819.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/84300431648.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/ramiworiz.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/66164032540.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q5tguf1k64u7jqhp5ebj4mnvj2/84754687071.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/dbc8533834185c8cb2fd9b05aac305b2/43296438155.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/55777104616.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef0f4779f---kovupat.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/34271523351.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/rivulovafezewaxasakoju.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607588d4ca35f---sigaridosif.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d363c1ae4ed535585d73017a6f1bd51f/fozukaxirikujus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vlookup+search+textPDF 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 10540 bytes
SHA-256: 60c57e28cb90c60dc791093f602471d51df7a60cb18d89d86b43bf1f200aa8f5
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16512 bytes
SHA-256: d555c219cf9e8c733f3b8f6023af6bbdd424d5d8bb402f98daba9218dc9e6260
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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