Malicious PDF — malware analysis report

Static analysis result for SHA-256 807e4cc4b5b258fe…

MALICIOUS

PDF

97.4 KB Created: 2021-07-07 01:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b95cc59ff42467d225f030f6e16b381d SHA-1: 6060e1019c21c689ea3624a249afcd28366014f9 SHA-256: 807e4cc4b5b258fe4dd0edbf46d6eab8ff6a4e0cf7d16445196b3ca6a10e863b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/55150dd5eaa1d4c9829d6ee73c1f750f/70645093852.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/xevonumijikipejodiv.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jomerijosefezajusagori.pdfIn PDF document text
    • http://www.bash.cl/media/file/turabezetofado.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/82737880e4413d5b7ec2828c27a67ad5/61336272835.pdfIn PDF document text
    • http://megalaserasia.com/upload///zofuvaros.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e282d399b2c0aa5d13ca1e4376659a82/mimox.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566178db91---24473713412.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/denabilonunejeta.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f69c577a05106bd7d15f10928751263f/gemuruviruf.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/pr6fcsgi6s6kfil3micdaq6bd0/36177011630.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/93738548876.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0mbma9iv8sarfho7kuerqsrrad/gekabewufokirajewotug.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/39214617660.pdfIn PDF document text
    • http://usmleworkout.com/files/file/denuzoxogadok.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/ditotumoxaloro.pdfIn PDF document text
    • https://invest.pl/userfiles/file/41913989935.pdfIn PDF document text
    • http://armanetti.com/images/13993333427.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/93106879258.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/lamafuze.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/naruzomenazuj.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/205588428860cfe55a3376f.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nemogawigoverusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lacy+hall+brunelPDF 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_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 10160 bytes
SHA-256: 25085aa2a870d336ce7ffbe2cc21c0f31ec45a32e5416275cbf1a08be446c3a2
font_02_sfnt_off00014852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14852 18920 bytes
SHA-256: 359249abb1ec8c44165764fbed558db958ebd7bbb5363604caef1937ebb72dc9