Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8b0a110433accb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 17:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e814927b9f3d1fa36a03793315c79d03 SHA-1: 5a9d3348ec4adfb2cb1c07a87cbe75d87aff4bff SHA-256: 3e8b0a110433accb2253d6ba78c1a0518110d4f62553c7e4719a82074c5b1f27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://wsp.pl/userfiles/file/gilux.pdf In PDF document text
    • http://starinviter.com/ckimagefiles/jatetubuz.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/vagigof.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/jefiranozoluzatoduxure.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aec1f1698---zujolulilegorokawi.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zapedavodob.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/79942805839.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/sijitawojilupe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161371153acb30---12331734355.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/xanatunelubepekowij.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/76793636195.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/89920758918.pdfIn PDF document text
    • http://zerosquareonline.com/file/gebanavewokepus.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905082125.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e45353fed---mamuxupevuzemotegise.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/13239124582.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/54266531161.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/jofitubefuxenijovosoxuzo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/73341323868.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/95714145389.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/56342491518.pdfIn PDF document text
    • https://remini.hu/userfiles/file/lojabekaxirewo.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/togigig.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xidonetapa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9064294d5---49630722164.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/disukesolerizanevovatik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+mac+for+android+developmentPDF 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_off0000bcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF2 10900 bytes
SHA-256: 5a0a292e13420b3edf169a50de30d3f026744ee56fa02a95874372c6db6a9d0c
font_01_sfnt_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16816 bytes
SHA-256: 1229d8b5e39326d0dc76eb067917e7e3f3430c8ddc6ad61abec4683bcf795f5d
font_02_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1