Malicious PDF — malware analysis report

Static analysis result for SHA-256 163e9bc9cc214e85…

MALICIOUS

PDF

98.2 KB Created: 2021-08-22 04:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 708a5b064f35f49e68225cd8ccc2f520 SHA-1: 31b43823b74ecad59d6f8af5d4fa0d5345ff654a SHA-256: 163e9bc9cc214e857e9ff927cb14ce3225d0bd0dc22b8186268381c0604750c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://theprofitnesstrainers.com/userfiles/file/97751563245.pdf In PDF document text
    • http://jhdjt.com/images/upload/File/87346249060.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/604ud1u47g8nhngblca05sbqof/4537425943.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/98971281598.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/mewubosukavupovosebu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6640dc96a7---fekubu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1d8acee9ba2496d63beda9c6feefb820/tapanigobagowegititofite.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3ec8c0efc9039c8293628723c1a739bc/mexegafeverodexupix.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612061ebcb603---nugezamesasisobo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1f5f77ddbc118c2134cbd263ca4ace19/gujuvodubuvoxifakudeb.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085559d8243b---fuxugojexarodavo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/59390298151.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/13642492100.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/domunakuredasomatajasap.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/disikeriwimafovafosu.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/96485386623.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/64953744208.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/30685967402.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/49238574238.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/rogamevofozowonimilojox.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/ruzajijejugagax.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bfc9aa96---28010916589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+babysitter+2017+full+movie+hindiPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 18928 bytes
SHA-256: 8191360f181aadc072632f9f8bc6c0e0355be1bb21795654a9dac163d10207f2
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 26320 bytes
SHA-256: 0bfa2f0856e538d55daf4a261ef192da4f911c8a52968c268c47590af3438cd5
font_02_sfnt_off00013906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13906 9360 bytes
SHA-256: aaf1bfc0475c1e36c6b7f5d48a5f782a227e92f4277aadaf466cdf46318f872c
font_03_sfnt_off00014d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D13 11348 bytes
SHA-256: 6de0827bbbb3ce254431724e09b02ba1ec5098f9c684140e369d2a4f38fd95dc
font_04_sfnt_off000167c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1