Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4eafa3e888b486…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 01:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aeb8a201552ea11f4d8932599dde9d0 SHA-1: 5b4cf86864b2d9e73e46bffade93c04f3ffa7eb2 SHA-256: ae4eafa3e888b486b0935bc46176d4cc36fd00a770a012ddaccac794ad1c0036
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and a phishing attempt. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document is designed to trick users into calling a phone number, consistent with tech support scams or fraudulent billing schemes. The presence of numerous links to potentially compromised or disposable hosting sites further supports the malicious intent, suggesting a link farm designed to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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://morebricks.com/ckfinder/userfiles/files/45899875340.pdf In PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/35220699310.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/vematef.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/97170557561.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/90919315849.pdfIn PDF document text
    • http://rafaelokazakov.com/file/25019317411.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378db23e1f3---73958317931.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/kosesozateg.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/wabomobitaz.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/73111718524.pdfIn PDF document text
    • http://montesantangelo.it/files/files/xubafanogu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/6692680493.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • http://parentini.it/userfiles/files/gitugovipafubegobo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zoxosojamuwidagamolife.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/55414960496.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4e3eb74af910e3354ca311a53fdbf0c9/44408591524.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/32879912060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a133bbaa2---6918159729.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145219694626---28711976944.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/pumirafabojo.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/96472914073.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/17151763346.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d35135d9f---ginaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=firestick+karaoke+appPDF 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_off0000b851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 16752 bytes
SHA-256: fe44d7ba9cca1c4cdf686aa30f5b8e8252ce0f1f0453db1b4f22c06938784803
font_01_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10284 bytes
SHA-256: 402635561352c86e50539dfdc67ef9af0e659f868d256e1d4450f1e87723dd75

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