Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8060db145bf354…

MALICIOUS

PDF

80.1 KB Created: 2021-07-13 23:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6e9ecbf4df98ad8a6dfe682dd0fbb0c3 SHA-1: f108a60e2ebdc567f1af7a92d63be268d1336b8c SHA-256: ef8060db145bf3542723316e2734546e230b92cadfc1066f5756803023237f59
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50eea4621---2717618122.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f40d85d5---sipikagomavazugijigebu.pdfIn PDF document text
    • http://4bx.pl/public/file/18444046877.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc38fb6bda2---pizekug.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/48382993272.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c03b45ca---gajefekuxozivilaxowip.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1fa4aa70c2868eac6d843854180dbbfa/57638384135.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/s3pgq75h8nkmnbien7h19v18ef/feridilisejizejolupuwog.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/44229116779.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/29718902425.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/dapomup.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dd407ef7b90f9b602ef5bf4508f2da48/55614881182.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/49281641349.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/89813259725.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cc1da5eed27ff6e31c5cb17540781698/64673622309.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b793f5a03191ef5d9389fa135f28500a/95199434768.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/66285704494.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1975054b8---jizuvewumuvufasuweked.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/sabomijakebozomanoxirova.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/wuwafuxobudemanakag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hurry+while+stocks+lastPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 10604 bytes
SHA-256: 22bfd0d093c5ed40fa233272393fda03f0ef73bcaf0a12e7d794c4c8bc4e8b04
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 17612 bytes
SHA-256: 60b44bff0a85a940fa6f904fe2b0fc81791988aa3a2237c0070f2de90192aa49

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