Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9132d52f741ee6…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 22:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e0d9e7055b6c2cc41d34f4850f57425 SHA-1: 94afd2a63382a2a060eb43f5a439701a9ee74c91 SHA-256: ad9132d52f741ee6a2450cb2eac4fb52d28cc2058d89acb912dcf0a0be953ec1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous links, many pointing to potentially disposable hosting, suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/93312td4tu5jncv85odut5fn3r/44628471422.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609001647b568---fujipovumolejanobevebidas.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dd7jima4kt4o69ldqi050rq2a4/68819187142.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/vugagefumijidizewuni.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/33628796665.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/kikepobizajudikunaba.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5ef4eedd144ac9e8c60faf633bfe1856/rigoti.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/9828628221.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/aa358f53e8ae90f1119a8c856bb3af8c/352819629.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68687424519.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3963d243---siwudajarodovujuzowatad.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/borata.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/48701850936.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/31770699101.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/8d1d393ec049a4c8a2616b9ee6b617d5/repubuwuzob.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a210b7271---13724299374.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a5ec6c65---nazumubawikotuwi.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/46606510637.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/43780698503.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b9ac3f853ece51097f03e11de8c11a6c/liseko.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90aa981cbe---71247435187.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/jekawuragojonaxojibawa.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f561ec---jebew.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0a5f503a5531d7c5efc74206f1dd0cc/mofepimavinobujuroke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+much+do+u+love+me+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16100 bytes
SHA-256: 582d5c9ab5f53bc4280e8292d8c39244f9a43f3394f2b235983a93fc97c2d1a8
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 10688 bytes
SHA-256: 4906f3bdad0c6853348ec9ee25125b31a7a46674397947cc465a06d5bb7f6c4a
font_03_sfnt_off0001394a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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