Malicious PDF — malware analysis report

Static analysis result for SHA-256 41792c7a385a1d35…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 03:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: deb740a47800e326ef245a683c2ced49 SHA-1: 17af75a0b50d9ae9993aa581add38fccf74c5f95 SHA-256: 41792c7a385a1d350004a1e58404624a3a84d3b3dbd60d18f8a57027df2fb831
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=minecraft+apk+download+free+java+edition PDF link annotation
    • http://phutungvespaco.com/luutru/files/tisameferi.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/vuvafesenitazazu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161400fe57613e---96879468470.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/26704105374.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/041355193136.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/73754874592.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/90168747494.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/vekaxugidu.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/93659749819.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/79905100358.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/80819978535.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/fobewubix.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/valamasojuzupi.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/likinovime.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/wiluxozadebeme.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/13979376796.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c08851d5c5---varago.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/79118621660.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/gogalotarap.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135c484c04a8---49653586626.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438e136affc---92065778961.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/bodekoliludivifopubepal.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/pobitove.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/nuxutofeduk.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/18606921904.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/34536056305.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 10812 bytes
SHA-256: 79af60cdafb5ddf518c3e3f81cac24f4cff38728f07d61242b84763b42bcc8ae
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 17288 bytes
SHA-256: 09bcc6c3507ddd76d6df5da56a9a0d03ad4f966a8f36ab1957164c51fd4114dd

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