Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5b878f06ed2f32…

MALICIOUS

PDF

98.1 KB Created: 2021-08-19 16:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61753115ee970cbd33832c66dbd68dd0 SHA-1: b9e9536083ded75b5f2a14c94798ac5ebf61bb84 SHA-256: 3c5b878f06ed2f326e4b01b19448291be36e33ba3a6b2082cd90cf54876840ea
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign. The document body, though heavily obfuscated, likely contains lures for urgency or payment, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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.
  • 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.
  • 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
  • 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 http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025af8ed68---kuwumezerimaduridosiw.pdf In PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qejqj7s8vrtlado35jtridn56h/1960156944.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075befe3d223---79422680011.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/bobenidomewesifipetadoso.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/8685764469.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2qtkid2dsv3jf9cv5mfv9edvvi/ruvog.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/20886852773.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ojf3m0cjtqt4tn7dsgv3s3tlr3/redenolovofalofogevifota.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/watezafug.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d60f7d7cd---55637707080.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u7t198f948ek2ojf3s5lsf8kk2/biledizixodiridorosewug.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/mavodonomomopowad.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1dcd79e2---68127793559.pdfIn PDF document text
    • http://gyobel.itpublic/file/35128030288.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/56902988243.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94810012023.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/runobumezukarelavoninol.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1fcltrm54n07vecqmtt4pd32mp/gatadu.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8173c7b8---60650804527.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/44184415619.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b4976eae---99264829498.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/juwidaferawaxotogonirub.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/66001847492.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/83785192583.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/nigolufetiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=barbri+mpre+outline+2020+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_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 11024 bytes
SHA-256: a93dd5133e54bbf0233cc5b7de1017392fbfee3142604827a2eb1f3c45c3ebfc
font_01_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 17784 bytes
SHA-256: 15efb83b8472a13ed0695df6d97e9e40e9f95d3d6b26d05366324a1b77344482
font_02_sfnt_off00015f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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