Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1944908c62b36b3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 15:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a976d5a36e925081545ed55d1cd7f3c SHA-1: 286748756fa0b54b604cf8eacd798dcd78d59c91 SHA-256: d1944908c62b36b3d54d7da1431755511c2871fbd615903b4c9fa479badcc31e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many pointing to PDF files hosted on potentially compromised or disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--fct8ml6mwue.tw/uploads/files/mogibegojafirexezumisasi.pdf In PDF document text
    • http://robwalker.net/fckupload/file/22156202618.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/xawupogekogoke.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/bedavirejijilin.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7d31071efd37c074d607776aeeb734f1/95802328430.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wisan.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/jizizatuviva.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-20/20210720051037822975.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e032924473d---gunusun.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/14872112809.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/57849993702.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/revaxuli.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/62053881113.pdfIn PDF document text
    • http://techbis.pl/files/file/84202478825.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/un9bl9n3jcrl2225uugrdcgu91/58019378778.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d70e13a704b---41833479955.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/15275256969.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/51554475110.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210809_221214.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee949826d---vutinofaniw.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/bizugataxubujimon.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/2716378838.pdfIn PDF document text
    • https://fasaac.org/temp//files/wurezubapevakelifone.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/mocibiiv1e5f3kr9eqaoped1tn/fasajo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43f25c08f---45264505902.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/7138022228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=solid+liquid+gas+worksheet+for+kindergartenPDF 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_off0000c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CF 17596 bytes
SHA-256: 4abfcda9403ff01c5548583686564d40f8e162793abe8edc4a85d1e72a0dc3bd
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 11132 bytes
SHA-256: 5fc4a2d7e095779b6cc6eca3d8145d72c35ad66c7797cf837bf7b01616060ffc

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