Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a66869bbe699d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 16:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3362816a65a1f65dac2bc4f80f8ce5a2 SHA-1: 87d4a7d74c08198a4c191737a81002d46fd2a503 SHA-256: 155a66869bbe699d93643154243e62bd1d96a15a25b7c9c005cba866d912b7d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=shortcut+key+to+close+all+tabs PDF link annotation
    • http://ediljolli.com/userfiles/files/11020136648.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0677da4725ee7b78252bd52170d43eb/41171009892.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/53269290003.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gadijexilake.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/zefesijupixitalejikedago.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d4dd9ea5---reburibul.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/18614344865.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354c8e92b9---zigizapuluvag.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210914193144.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/kamodavonijide.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/61425014413.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7401894---19235091217.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210907083237_hamsi6.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/momotagitelop.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/702045133.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef183efabf---41822116066.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/tuwopunolizavebexa.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/piminuruna.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/87450232209.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/remaduwawaxutusuxavat.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gifaxapi.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/57362681550.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/16591620891.pdfIn PDF document text
    • https://duel.pl/userfiles/file/kijilajewadanitagaxuz.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 10652 bytes
SHA-256: 77ad23a407c93adeb3cb815d0dedf474f0e0e536505c29e66ccc0e87cab0f97b
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 20344 bytes
SHA-256: bbc92bf0123666d24e3d7d6919477710e8ba30bd9bf01f16d8928072bc3bfde9
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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