Malicious PDF — malware analysis report

Static analysis result for SHA-256 320b4042f06daf9e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 08:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba014fbc050d39a290cafca2ae94ee0e SHA-1: 682b2cbecf67bba159c8f1360a8892c5ac16f4d4 SHA-256: 320b4042f06daf9ec3654d512c1bb38452ae3dba46ac9ddad8b2c8335773e511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains, likely to lure users into downloading further malicious content or submitting sensitive information. Although no scripts were directly extracted, the PDF structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.tif.cn/wp-content/plugins/super-forms/uploads/php/files/611bjhivibgrmt7q2cdemu49t0/bonukafujawixezuzobe.pdf In PDF document text
    • http://ingegneriarossi.it/userfiles/files/84502703564.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/88493418756.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/gubaxamefijato.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c385224cc24---luwixurikarefap.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/35062603523.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/wodaluloz.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/gukejexisekuxifolibineje.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/5556670052.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/38918257847.pdfIn PDF document text
    • http://berbun.com/user_img/file/tagil.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fd448037f423386dd20bc7c72447263a/28419051730.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b95ops8k2cub20utc95bp2kqut/28313741177.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/wezuxulajapiw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5708cec596d2e99f568e8745199c7424/dominedozimokagobimaf.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f344126c8---45212121817.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/doxevivebuzupojanajinixod.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fixepujogenimamalikomij.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3ea07cf4---9899167306.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wezemepokesopojoliwer.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdad0c1cff---97589676925.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7612c4c7c225bbe3ee1cec9db33a36d6/66215533079.pdfIn PDF document text
    • https://mattress-leader.com/media/riregowinapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iso+viscosity+grade+chart+pdfPDF 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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 18696 bytes
SHA-256: 5ff0e47ca8a944f7aa064f3249e69172e7d539cd616968f3a9c1699a2f72815b
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 10880 bytes
SHA-256: 14cacb91fffd4788e4047ef7a5cc8fe269a47c0b2362b27981248455847f9d29
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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