Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c070e55b86cbc1…

MALICIOUS

PDF

95.7 KB Created: 2021-09-06 18:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 473ea011f55c049e33e5a5d683c81e3d SHA-1: 9174d201ea30ffa88be093fcba7c5aa560d38298 SHA-256: 63c070e55b86cbc13b23d8532d41d678cc0699b8d1c30ddbde634df56bb4ac6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a PDF-based phishing or malware distribution scheme. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://archism.ru/uplcv?utm_term=saab+9-3+2007+owners+manual+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103281d2808f---92691025870.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/nebokilavikubosibobofuwe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e68e4eaf---vitubutusoti.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/61519694371.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161247c640cae3---98682958401.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/08c97fb6f74d95c018e28116a029bb6b/74513937312.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/48994971852.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jokogimeka.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/3040774555.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosuladanusegulego.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/nufuramodisogep.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk6uva8pc0o4onm6kt9njm8igd/93141442973.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/pedaderupivatenadekuwam.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ss67bu16hmdoaks534g0c4dqj3/8344826790.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5582cd5---noreguvozajobelaxukod.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/98497306344.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942fe7c65c9---97270715527.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4762ba94a---xomawolifitaw.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081722042373499.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e971464303---96182691917.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/31194119797.pdfIn PDF document text
    • https://ferropula.hr/files/38143983449.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/49538876595.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10bd28ab5---varizi.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/13303159129.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/mivajiwasezilikum.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/88342518805.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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 11536 bytes
SHA-256: ffd1e968ba3a8ee1417040ff0820dad29b5f103502933f056bde6f656a72d7dd
font_01_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 19316 bytes
SHA-256: f76b0164a50305807bf4338e7479a4dfa2a5d872f9ff41c22d6fd214199231d8
font_02_sfnt_off00015860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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