Malicious PDF — malware analysis report

Static analysis result for SHA-256 20da1290df2e655a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 05:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64fef79faf096097efc8a2f30efbe176 SHA-1: ce9444498d4033665ce3e574cc158af3fa00d152 SHA-256: 20da1290df2e655a57ba8238af46092185db0eade162db3293575178eda961ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lmtechsolution.com/userfiles/nivedesix.pdf In PDF document text
    • https://solidpractise.com/files/userfiles/file/62457306357.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/bokudopefovonunezivu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140921531911---rasedovelovotafimuto.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a222b056e---kefofomizuvejukolegas.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/varozaguvitibiguwal.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/narup.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xaxar.pdfIn PDF document text
    • https://euchebnici.com/img/file/fapofaretenakariwurede.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd55f804ec4af753d34b9398244b2064/60643454307.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/71929d9c7574c6566f7985f58e7f2c4c/68812606216.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/nasuluketagexawig.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210914185332.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/jilipaxukoganosupemez.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mudoveruwilunukab.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/19276097362.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lusobezifukudejixunenuw.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47235964291.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zafusevakazorazatinom.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/nuxomaxolodoke.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/49d33d21d2f8ce6dc868e55a916f7627/lawasolivilonazapo.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/winutujukodusimimil.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/17529498529.pdfIn PDF document text
    • http://qdjshg.com/files/file/xubodobegozujikul.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/vixemoxifomutopavafobuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+a+live+picture+your+lock+screenPDF 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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 17696 bytes
SHA-256: 74c3e987bc610bc5ded18ee1390218dbf9de7a0cf4e5f09cd482d5053a71c66c
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 10984 bytes
SHA-256: 2f498f4916be43b381d83830470ad2c2ddee7aa6c17b0a3b95b568b315f45bca

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