Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53c662bba48725f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8043191c34855c4b67e891df72500ffd SHA-1: c3426cf8840bbb45349cd926c5c78b365fa7efe9 SHA-256: b53c662bba48725f302ef9df2bdc351772231a785de1105e0a4b10ed330d93b2
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The heuristics indicate it contains a callback phishing lure, prompting users to call a phone number in a context of billing or security issues. The document also contains numerous links to potentially compromised CMS upload storage, suggesting it may be part of a larger phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aduanaldelvalle.com/userfiles/file/93968098715.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcjadu68pqfas84prcesdqoklp/fefixuzexe.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/68181290342.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161204d15eef20---70325157103.pdfPDF link annotation
    • https://gizaviation.com/uploads/files/musotitimeluronus.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/rexerobo.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/kunepelofekazo.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/mufofojapu.pdfIn PDF document text
    • http://www.bash.cl/media/file/neperatiduvavopazodelomuf.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/aca9eba119d6529ca02ef6064aff066f/wefolexa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7c596109---75754353127.pdfIn PDF document text
    • http://calisnt.com/uploads/files/85273670712.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/gotenafajamawamek.pdfIn PDF document text
    • http://sparkpro.lv/content/file/dupejibonofom.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/16061277930.pdfIn PDF document text
    • http://minerva-collection.net/files/files/3357979828.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/88538824920.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/debofafetotuf.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/3699509842.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ccfe9d133---91436284375.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/756895fab5f5479804cec8ed089f4c46/rexasowajoliturobuk.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071db639b3cf---91132729593.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c269551a---dubirepikaxiwoloto.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ea5b3934---mavujesusotovu.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/jupidusenijaf.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xutun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=servlet+java+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_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10276 bytes
SHA-256: 73b5aac691c80758e63c7216ded36b0ebc4b812f12076b10d61b436327c414f7
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 18872 bytes
SHA-256: 30ba5542d18f5eff4f96d8da9e18c118a6c604046060198dd65cdd00006c9363
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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