Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84ce10666fb0e2e…

MALICIOUS

PDF

72.0 KB Created: 2021-07-03 00:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88049e5c53c0b8a035759f7d85e1268d SHA-1: f44128dc14b43cecd8aea707e86dfd8e5163e1c5 SHA-256: f84ce10666fb0e2e43797c776b9b4146d8a74dcaccd99a3ada9003f7e77aa2b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting a phishing or malware distribution scheme. The primary purpose appears to be redirecting users to malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4ddfb3861124f5870c4ccc0fb99a3114/bunozowif.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/790797688112438fde522b839fbe34f4/11860669280.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9800e6b9ef527e01465eb484d845402e/76139072699.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fofemopeborabegaxegisifa.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210604180002.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/60422984998.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/zifamafulivos.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3137b412acf3e6fd123b17cc6676573a/vizal.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/ravotiviluru.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/vufuxurikatudosiviwedita.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210702_3FDCD5BD2B39FA7A.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87b37f1ec---koronowemoxaj.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098349609e74---kujikomunonuxe.pdfIn PDF document text
    • https://rintrans.com/files/jijanabaxixibixa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/191gpbpj0qsc292qfrbhhnbk62/38510773612.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2c949ce2bcb627c05a4b2c2f0f9d116d/fujumanunutakowisibom.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/mavulitututekef.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/63443015441.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11d75b99---mekiguvogupap.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/zigozokawuxunowafapemab.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0cd0539f8---darorugenigatimop.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/90ab270bd040b4ae3b233715ab98ef62/fabegusibubopijapo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b655c988---lefutas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=40+usd+to+brlPDF 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://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_off0000bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 16728 bytes
SHA-256: e39f9c4fd0e76ddd30cc80c5445f022f0d15e2ee606ee14e5f1dd81a04cd32ec
font_01_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 10096 bytes
SHA-256: 5fd8243c5539f62978362a2ad536f022cdea6fd09c4067dd6734312839b899fd
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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