Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c9122e241747e…

MALICIOUS

PDF

84.6 KB Created: 2021-07-28 07:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23add663d7d79536a8b5405f923eab04 SHA-1: dd5ecc304756e650cf8a75ee607c507f1818e7ab SHA-256: ca1c9122e241747e220f62a7f9c07a66b1e53c7d091103db4bb266f048d8f6fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://agatanorek.com/files/file/bukixadopikerunukebitonuf.pdf In PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/zizelaxamib.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210617_010809.pdfIn PDF document text
    • https://lemanssrl.it/file/ludaz.pdfIn PDF document text
    • http://dsraxys.com/uploads/6507529159.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/918da1b93a560f0f74b018805d0ed626/59971525297.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1462b3e27---xajolovenuxafebufebi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846792d870d---vujoradijojinela.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/51412882660.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/lolevogibeledobaregikosib.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/tebapivelakolivuxadig.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a23297e50c94ca96dc503e4de4eee41/titobuvedopukugaxopar.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f635636e7---wadix.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/vizowulavaseduwino.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/aj73qrcltqgcn4lo4eaah5qg9r/19196042672.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/nojawuz.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/78400852303.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/63127181065.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5371b39ae5b0a8d50657df5d8966759a/pidapavinadinoloninerefi.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/71536198687.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c3f13c405---dusijakujasur.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zizobikikagogud.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wujofap.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/ladupigotaxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+factory+reset+my+moto+e6PDF link annotation
    • 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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10612 bytes
SHA-256: dae9ee5b75c420949bc267ccf7b37cd954c29191295b210883a9318bfcc9db1d
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16816 bytes
SHA-256: d2aad497e5cc86b55caa4f3e674999f183974924eb829ba4752d22991951ce55

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