Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c405ffbb07c974…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 00:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ed34aa2f1c3524b015cb1e096a7b0ca SHA-1: f7e11473862cbd1e3eb14f334e81d0d08dc1b6ce SHA-256: e4c405ffbb07c974b1eb4bfea207c71cb61844581e96fc5f355e47f7754697c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://krisoc.ru/uplcv?utm_term=x+ray+app+body+scanner PDF link annotation
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e44678a6d---82068291391.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/fipuni.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/xuwofopobivexivi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa7579aca---taputemubovokogami.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142578cbe251---9024848481.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/lanurifop.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/57849821071.pdfIn PDF document text
    • https://efnnma.org/files/file/38804526866.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/49148300496.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/52135074050.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/79030833197.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131467cb7da3---50036542175.pdfIn PDF document text
    • http://trubaopt.ru/content/file/xoletelejozeredevano.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a647183dd---20811873527.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210914040931_1415569248.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/26815029725.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/47438163285.pdfIn PDF document text
    • http://www.polni.si/Images/files/85480451126.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sunofitiwofafomilekefe.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/89892893734.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/42952421928.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/55270472846.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/kuzazabogikuxam.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/jekirekisixigobalu.pdfIn PDF document text
    • https://haidangpc.com/contents/files/zuxodez.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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10532 bytes
SHA-256: 1eb8be9b2505c2d945e668d74074b430251c27bd9694dac869271f63692825fa
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 18380 bytes
SHA-256: 3010a781707f957cd27e431eb4b3420d6ed389a5119399739c35931f7fb9f090

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