Malicious PDF — malware analysis report

Static analysis result for SHA-256 a862549c875402f3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 05:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 411491d197694835a838d39c12382018 SHA-1: 68d87c1bf825915199d9cf36a2c5b2a0d642a27c SHA-256: a862549c875402f3cb41b79c825fdca26bf92d06f8bcfa2f03d55c6498576d3a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the ML classifier's high confidence in maliciousness. The ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://coretry.ru/uplcv?utm_term=equalizer+pro+%26+bass+booster+apk PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/38779175d87bf67da6a649318eca0d3b/xugujokudebafo.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/4342466864.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614233e3a9181---dawotowarina.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/40705388376.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dujiteguxago.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/22097401568.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/25663137683.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/84232891349.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5fdf3c7a---9673481481.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/30107148872.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/64559899737.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613894375f932---wutoma.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/pabupepor.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/gabugemitawifu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/65998157915.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/19440092333.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bujazikogozedenunetitoda.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/bulivaxitesu.pdfIn PDF document text
    • https://atlantidegattico.it/file/62340658881.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/vusizuzowunewasopazi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/74538325278.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/lumivabamiwadasezudokipu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/99730189720.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vekuvogelazikojoxegu.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/kazeroxovojegiwosomaxefaw.pdfIn PDF document text
    • 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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 10164 bytes
SHA-256: f67a221c5d8a63cf23de925d7a04aef99690702587c3b4e8f6aebaad9a250da4
font_01_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 19136 bytes
SHA-256: a57caf1d8a2a2f194d473261a5f548da8d1c9a15e73a67bf0a846f6e69aeca91

Open this report in the interactive analyzer, or submit your own file for analysis.