Malicious PDF — malware analysis report

Static analysis result for SHA-256 49226521be4f585d…

MALICIOUS

PDF

88.2 KB Created: 2021-07-09 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 11ea4595b796b1dfcf83ef4180c3e368 SHA-1: de0a9cbb97f22e05388508d30aa5805f31aabeeb SHA-256: 49226521be4f585daa67fe15066e01289ac9ce1749d68da0458fc6ecad72be0a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories, suggesting an attempt to trick users into downloading a second-stage payload. The presence of multiple links on disposable hosting further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09adaaa635---69589536918.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f04d749e5---sejobu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c6de77f307766712242ba0c24a21b6/wotuxamusenigo.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/91862066425.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/56892888381.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c627d7321---giwagub.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a63b5cd87915efba0077fe551070a51f/63767766755.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160949c25379db---kudepenipinadezo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/52958021443.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210708_168539CD3ADD67F5.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/31540051094.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e4a1cc1ea20787841f4aece1214ad622/sizaruloke.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/vagulezemozifixabomidi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wosewikaf.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/mexof.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2050f7d01f7d1ea026f44398ab4627ad/fivasavup.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c005bbe84fa---66634072159.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/0b41e58d46064fe2f879667b50ff0c28/fukadolapejetamakanodi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c6d6f8570a458e6b2083643c400e7402/bebexudamatugotigizosob.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a90d12f29fbf2ae0c7e5359158f0510f/55930415283.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/781affdac99ece67c9e5c3c859098b69/femuwodobaxu.pdfIn PDF document text
    • http://absigorta.com/E/file/65872244320.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210624071740033722g02hxu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608609b3a4af3---90300271938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stephen+covey+websitePDF link annotation
    • 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_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10644 bytes
SHA-256: 1a9584c60ee9aa5f90af3f150c3a28395a2c8ce1344502d217ca91c0c57b5e06
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 17360 bytes
SHA-256: 7f81c77e408553eadc4655ab27f3598da6143b89587a720ae7cea2b9c96729d2
font_02_sfnt_off00013b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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