Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a77ef93a66cea…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 02:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33f6c4d875e2c79d68e8a55a375fe8ff SHA-1: 9f7f88982104f06e67c909e1e3ce340e6a38cfc6 SHA-256: 123a77ef93a66cea0efb7bc8d9b3d381470c0184c03452f76e54967c30eb17e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number in a context such as billing or fraud, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=iphone+12+pro+max+vs+s20+ultra+camera PDF link annotation
    • http://simsvizag.com/admin/uploadedfiles/file///jevogejesofe.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/liwozimoxozovorodew.pdfIn PDF document text
    • https://blugarden.eu/file/wotifazoporab.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/10332260896.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/vunezofewu.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pitorudovuf.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/purixewijovopokigopuvan.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9cf53b7b5ea0523970de522a6b4db06b/21552526179.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdfIn PDF document text
    • http://africareview.in/userfiles/file/55514009357.pdfIn PDF document text
    • https://kawanmto.info/contents/files/bivokuxudenuvezirebefenuz.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rijurivumoxete.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/81980864128.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/96064336813.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23717906---paxifojeja.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/921fdc6272a0513d510f095ab05ecbf8/xefes.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141642e91176---5206538568.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/xuvuxisoxida.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113d3eb629---39757194148.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614164cd6a443---xivufujoludetepa.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/22529756675.pdfIn PDF document text
    • http://effektfilm.de/files/file/14621688289.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/6340091042.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kapibigopi.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/19724525848.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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 11060 bytes
SHA-256: c82285c535123c5c3a36008e7e666d9d084d0081a0ae0e38817c0fa4dad1241a
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 19348 bytes
SHA-256: 0c24c64265bae8845ba2a92079073443f29f8804853132fdf5acb83a620e5d98
font_02_sfnt_off00012cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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