Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bafb9670c2a6ac5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 07:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d74282740b1a113db05ddbfba8c0844 SHA-1: 42a16ef5d483e9f5a87de3a9ce4bb87538a5d614 SHA-256: 5bafb9670c2a6ac5d0a4c4ff40785508a81d52c8801b178ce0343450e11b4295
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute malware. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916215913094388ri4o7z.pdf In PDF document text
    • https://izr.fr/files/davezaneloloximamoxa.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210905220140120.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630628507.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/75881429101.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/xotobaribazerarexexeva.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kvsv9537d2ca0co9021akbkvl2/texedutejuxupovepoz.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210922210842.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/xovuxefonaparisuxonuwo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7615dfca6a7ace0b7e50a5099f11c100/kajulijigi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/ranubiro.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1ccea1ef---tasanazi.pdfIn PDF document text
    • http://boldogelet.hu/media/53385204132.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/90854123121.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/dolonenewabogofaror.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/92826594997.pdfIn PDF document text
    • http://ipceurope.be/assets/file/51997439869.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161422778b34d6---78641661910.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///26833674091.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57947487169.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/61449657552.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210919061459009357xfhb3ggdlyav.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/16044377469.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/85986891910.pdfIn PDF document text
    • https://atavio.ru/files/file/57011900357.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/zokumifele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=die+teuerste+app+androidPDF 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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 10440 bytes
SHA-256: 546710d031e01abc6673b0c2b7033a71a2b1a3809a8fbb16bf3e555bc54295bb
font_01_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 15100 bytes
SHA-256: d00ab5cff32e71cab1b106c726c0fc3e1f469cd87441a1c7f9237464caed46c7
font_02_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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