Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce587dd7a7f2937b…

MALICIOUS

PDF

93.7 KB Created: 2021-08-14 11:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc274f3ea0ec73eb326664141bf1dc56 SHA-1: a25f8e40075ee888becf7bb40e1f4c690c4d001e SHA-256: ce587dd7a7f2937b7b6990da1cdf1c71a24f6695f3a3f6c993234f48c7d538ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous external links and the 'link farm' heuristic suggest the document is designed to redirect users to malicious content, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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 https://medtek.vn/storage/file/xezar.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/22124129447.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8616f7d94a---muzomutugixekabolotimo.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/85511029275.pdfIn PDF document text
    • https://lesura.net/userfiles/file/47901811771.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5b2515121e5264578da13114b98bfe3a/14417513986.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40eda285d---13694445843.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/fivajilujamojalaxuwevo.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mipolo.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/97050065312.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160953d4856ee3---83645798827.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8je1vnajtq6pcg5hto3ot5265s/vonedenidofuxefoxoxeder.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76527145094.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/76806401266.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/414d6a8ae7f2221993367ea289a90ba9/42136953212.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/32094957323.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f74c537d---60202135480.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lonegujurovate.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ivd4i6b2b3bh1op48fg1eq3hh6/sebozolamunolusubipuzija.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c34d92d4---xanibifijavujewezeg.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/tikexubifaruta.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/67847828b2389b640895b468a0cbb8b0/37345042353.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22724036256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gb+whatsapp+pro+latest+version+apk+free+downloadPDF 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_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 11020 bytes
SHA-256: 26a4ce46a06c248639266717155f17f719be588513b5efdbbc3c8748c984f7fe
font_02_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 17088 bytes
SHA-256: 0c1919846030eed102e391a0684fe7ffa0fe0acb4e52c43e67e15a902ac99f72

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