Malicious PDF — malware analysis report

Static analysis result for SHA-256 0971ca60eef4a971…

MALICIOUS

PDF

90.0 KB Created: 2021-08-05 22:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d56f8e9d29a2081eeac0ac42b5e50e3 SHA-1: dd924d05e8747b152519b572445027c2d9e55674 SHA-256: 0971ca60eef4a97162829d1b94fe023a8bfcaa42684f89d85e3dea4701b08ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce6e562cd1---vitamogekoluseten.pdf In PDF document text
    • http://ankaser.com/userfiles/file/37562954174.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e19e5a655---48626943280.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086401a686f0---18204503504.pdfIn PDF document text
    • http://schokozentrale.de/idata/jafujubagunopogubun.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/59909420162.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/25016881166.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/80411979296.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/63112636075.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/panujofegaxoxewositu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a7fc8b293dbf383605617985f234884/88948623533.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceccda6d68---32422763122.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/zijorisiramiwakowado.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/20113703461.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4332c0c80e4e812a7aaee129752ee850/64188534716.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/susirugitabenet.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c392e88592---96433212336.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8fa52f08bae0fe128690c28d31989136/58865723316.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/gv7uqjsark325nbdfla4o5sl7n/88582048507.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/72e6c89af19eafe62b24f71a98c2a4e5/69508898308.pdfIn PDF document text
    • http://inercial.es/uploads/files/86284286175.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vojaxaxojarolirumetubizes.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6af160ee54b5704cb12b13d95da3acb8/52088570718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+drain+kenmore+washer+manuallyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42033ab7f---29555745376.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_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10896 bytes
SHA-256: f92157975c5831fa7f028ce94d2b9a359c378d4fdb7c97e66d9909986dfbc08d
font_01_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 17060 bytes
SHA-256: 32dd969bdadfe95b551e94c92248f0f3557e6ad603f1ab05eafca999b1a3801c
font_02_sfnt_off000140b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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