Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777f4bb0ff483a8…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 03:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bab88b5f3da10ebb6e8676e832250fd9 SHA-1: 27cd9805acdad863cac2d1934907cba31f644b46 SHA-256: 6777f4bb0ff483a81176d0c2130b1a771d432db92c392e506803d06d1ab68ed4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of 'invoice' and 'payment' language, combined with numerous embedded links pointing to potentially compromised or disposable hosting, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://triangle-electronics.com/assets/userfiles/file/31136467474.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0eaa5607bd53e6bbc17206cb98b092af/42149412483.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/talimadiwoto.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b6e6ab29ca73cd6dddedce5d92e8dd9b/tezijelu.pdfIn PDF document text
    • http://theponghop.com/upload/files/mamesule.pdfIn PDF document text
    • https://computerzone.pk/file/bisipa.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34809e771a---89008087972.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f4560d47f91f0344503a78f16268e59/ritogapadagizefun.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/zitenukozofana.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/59034796526.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9171a245c---37775146735.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/6f4339dec94aa2673a3ef33bb43df03b/ditudusovusaxemiwokuj.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210514043019228729e8b9wh.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106371deed39---duzunebugenovup.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/75083974701.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/660cf79ea2003f5f161585ecfc16b70b/tubowalejifufajinen.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e774d836b50b1b4ec017357371f4a0f3/74861056840.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/tibol.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2aa6311d9---milamimowidafinosisedin.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f96aed7a---weletunonosovixesed.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/61532531563.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/20308159544.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/funixejubilog.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90bd003caf---96484044768.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/72829646719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=manufacturing+technology+pdf+for+amiePDF 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 11108 bytes
SHA-256: 4bd0fb4d838733662c74e211739cf0adccdc3ec1d1e27e57bbcb1da4b70e3aec
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16672 bytes
SHA-256: 04b9c3144f5a17ba195e37fdc6af6dc4c0c668e371ae66498e66ac9ccbd36442

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