Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9db62bf50684fad…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 10:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ea7d525ef40e9063ebee3c280d57de8 SHA-1: a8f796f95b66a92fe3530fa891d1e21eb8dee1d8 SHA-256: d9db62bf50684fad8f85145d5ae0b378b5aebe7a15bfac6999b14842a904a23c
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://krisoc.ru/uplcv?utm_term=how+do+i+exit+safe+mode+on+my+android+phone PDF link annotation
    • http://koddous.com/userfiles/file/77051820849.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e1d98d1e---79439571132.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090418035970554.pdfIn PDF document text
    • http://riversedgefm.com/files/file/nopegifulux.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/98980994129.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/057dab07257ea181343df4cf320d1678/35333815293.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/51728449855.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/41305322370.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/71080964183.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/79104930478.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/16152928597.pdfIn PDF document text
    • http://rc-modeller.se/images/file///runibumuxebeledi.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/36624337282.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7cf5f9c1983a19b1031a673dc03fcfd4/58828367035.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fn8r3pkmk975ss75ahsegdf919/rodidufarejivov.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65956822092.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/90019898369.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/27119061871.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/71850708958.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/13ae23f8658a9c63fb3e1b7f9eeb6bae/kusox.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/81761935858.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vubevujatokafoz.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/muribelobiju.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/karixavasatufuverote.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/97925115354.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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 11008 bytes
SHA-256: ab2c7675959d3babfa4135657126281acf112511e11b80e9df1f5c27b7860c69
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 17992 bytes
SHA-256: 09e4687b8e12f99be273b13726b018e0a4f9301012a701d021070467ec3abe1b
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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