Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e8d77c0b292854…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 17:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d69ed95d6c90ad5ce861170d1e542148 SHA-1: 85c1905e7a9743dbb3c3580d779d83672ea6505b SHA-256: f0e8d77c0b2928547f16cb5ec6fbc3861a236f4bb99d9ff4aaf8035aa5d8b2fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084187c87718---68167550992.pdf In PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/06ec9897c884f64b0b481dace744f2c9/vizesupugawununupupaji.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946469ea641---59778601303.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210625021601.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/pemuxeduze.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jesaruwi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dfd680a4e7640b54cf8f182884ceba57/voxolunulu.pdfIn PDF document text
    • https://artenika.pl/fck/file/23124932034.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/wugovepunesomivikize.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5f3d30c9f54a2c395939ec24d7cb287f/85432777372.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/01fth89lbpi2id9a4qqsonv8id/sojijulikezibonekenaj.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/59432352984.pdfIn PDF document text
    • http://sakem.org/userfiles/files/72052573117.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/zidaden.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/80427947196.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/sapukotebinukurokaxowipuj.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/49004106536.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/97f008dffc33cfadfc2f0c39b96785de/43405995719.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/ruvuvemetijajos.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/74454804895.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/tvuq209ghvn6u49qau1c8ts9a0/wolonemotujazoloz.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/bitosor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=freelance+jobs+for+it+professionalsPDF 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_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16404 bytes
SHA-256: cfe2ecfcf61ab0da3cbc6d8330abe8bca026abb5ef52fba4323a26d49dc335b7
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 10720 bytes
SHA-256: bebee8271535f120e7c79b2ee03d4cb1ee76c6c261b77bba338b55da1c1dbafa
font_02_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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