Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8cfb56c63ddb0e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 09:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb691bedd29addd15d0ec7f35a1b67f5 SHA-1: 8364c905fc0686078f3fb503270c301a487d2f3b SHA-256: 1a8cfb56c63ddb0e378ca1ed121f015942fd330ba197130d0cfc015213c7002f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=how+do+you+print+2+pages+on+one+sheet PDF link annotation
    • http://eventclub.pl/userfiles/file/43555848099.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vepezalo.pdfIn PDF document text
    • https://longhoang.vn/upload/files/83768958731.pdfIn PDF document text
    • http://goref.ru/files/file/44768926099.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/31431506047.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/85465495139.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/51137982354.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/80248955571.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/66315730994.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d76b8b7219411c624ffd4347fb46d947/jilonuru.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73ca79d4a---98442037817.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/jijemazuvivaxumiropu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_C468BCAC4867F61C.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/20030688284.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a2c0e19e---rerilitexowepesun.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xiwijuradape.pdfIn PDF document text
    • http://honda-vo.com/upload/file/8075859888.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/78171471726.pdfIn PDF document text
    • http://health-bridge.in/upload/file/97622175913.pdfIn PDF document text
    • https://funke.be/data/file/ridapapatililitifikax.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/jegimutemem.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57021761212.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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 15704 bytes
SHA-256: a2da5b43a76b52d735304f9908aa33a4e4078b62236dcf55a7f593cf6d432f99
font_01_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 11036 bytes
SHA-256: 8589fb1ea447df836a983350e8e4c3e3de95d9ba01d5510b11218290e97488dd
font_02_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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