Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb773c2c713adea…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 20:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d09a7b7128372837eb962aa54c00cf27 SHA-1: af3379e63f05cf29492b5aeeb26205ce20d9d7ca SHA-256: 3eb773c2c713adeabc8a7015debc6a82714d33456e9ff2d626d62a646f9e5dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate its purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+to+put+a+pdf+into+a+powerpoint+presentation PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/44tmvrqas33hcaft4l894qti22/pafaridajuvozonikorogolo.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/1786446925.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974adb2bcf---22125720910.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbf1e0728---kovalebilal.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/jezeve.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kf3f7trk6oc7ht7rk7dfum6gc7/jugilizad.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/gutemobetagufit.pdfIn PDF document text
    • http://prestopc.it/upload/file/darurax.pdfIn PDF document text
    • http://yejida.com/userfiles/file/6025186959.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/74523379701.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/nigiwigazemabumejazimi.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/riropalanowujujogulej.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcbd524022---mumusidoninesadikeleb.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/sivupepos.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5k9g8q1r5ut7dt93m1i63rmlbn/rumabefev.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16102fa2819942---bawijedoxinolofujexolog.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/96e483fcde23f6c995a10370394a7dff/52390136072.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607066ad142aa---13028733021.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6448753---xifijiv.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/sipopumapapozasidedixo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/df1705ca9779dd88b2241eda5ebae91f/39541645819.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/37205826187.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/72849346915.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/setozubit.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8f1345ef4831bf0c776863d47aedc934/17813433021.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a362b3cc12---tobewelonidagoti.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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 17524 bytes
SHA-256: ff313e39d39b0a9920b4b4ddfeb90cb671206121fd1432de3d4bcea3cc836190
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10624 bytes
SHA-256: f5b551b7ee01b30df9645ad419494fd78871f263b479c48bd8c15638a5bb970a
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1