Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c60d46a725ff044…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 01:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b595ba1e70a0211fcd51b59c2357d3e SHA-1: b73c2d8e1da6a99e9933d8fccb4aec4034fa0f05 SHA-256: 8c60d46a725ff044327a64473d19eeab4814ddd0e4cb2bdd87a16091c54d6ee5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://momsystem.ru/public/file/torafagekifema.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/fizopukazigapomobexi.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/14239362790.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/17966186058.pdfIn PDF document text
    • https://shidoremicrosys.com/media/97178734669.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210911233010.pdfIn PDF document text
    • http://airmon.hu/images/files/27636373783.pdfIn PDF document text
    • http://topp.pl/_topp/file/kajaxogazebagoxijefedum.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/zenisivivuritefogilotaro.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lsh4kg2tck95p25vtgfr4lmfvl/vudoxel.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/93823529960.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/tivoveguxevenesorezegugi.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/29544813119.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/76126782735.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/27327536185.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/54826110285.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/80367212580.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fagaz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/49bb3a2c567e9006baa2addbed4d838a/wukuj.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/kepebuju.pdfIn PDF document text
    • https://estoniapools.com/contents/files/fajozeneweguzamog.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20fe4b928b32e864f47761de6cb8b64f/finegamatufapaterowuga.pdfIn PDF document text
    • https://arerp.kr/data/file///70345981482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+off+sync+on+androidPDF 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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 10584 bytes
SHA-256: eb2041fb1da4ad5bf387ae03726d0fde09373f0968a7e3db014d85eea6618099
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 17556 bytes
SHA-256: cf99b5049f907278a9ce185d4771cb12c22e4e9a598d53ddd8190f9f1bebade9

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