Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1efda022d94b3fd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 15:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3d8838f59dc1ff1bccf42bd57816bd7 SHA-1: bfac183b637a9d230095e1ed3761db18889cb388 SHA-256: e1efda022d94b3fd987766fd6fdd65ba625337ba3a898fc5cbd65b2377bcc149
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These links likely serve as a link farm to direct users to malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=onn+tablet+serial+number+lookup PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0ca5fb0c---35280829361.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/nirusegudananavowira.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gumunudakakoko.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c899e3ae0---puretigeg.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/palivi.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109060707447257.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/liradefogibaxe.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/38386824060.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gafagoporu.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/82928548564.pdfIn PDF document text
    • http://chemicalengineers.ie/images/juzogefoxizuxi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/37471283493.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/21185081350.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/zapejimotag.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/9208974445.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/91214748027.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/wusawomagiv.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161395c54a2353---23528035303.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/773433c38c0e022b43c00d42e0a570fd/volitavuwajizinoxifu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3106536e6---8186759447.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/zamogori.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/35426650451.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/uhc19o3huv2t4s2akq3l9ndb8b/64718436932.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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 17116 bytes
SHA-256: 13d6ec9244569a4aa6c9054e11e2b7323cb01c46b935ed41727f3a486126ff3b
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 10768 bytes
SHA-256: 2efe425d2d13d23bb63fe84d0f546a28f6fe65096460f9955bf8dc120cb933e4

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