Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1bb6ba5bddbfa0…

MALICIOUS

PDF

89.3 KB Created: 2021-09-12 05:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 090078089d0c067d7e5050363b3001d9 SHA-1: 233e651d81e712e076b1dc5622f9bd5cf510cf0a SHA-256: 8d1bb6ba5bddbfa08fed87601f5eded7489220b22f7c5df42f356a10e119e31a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aventura-agence.lu/userfiles/files/bopujusadesasowa.pdf In PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofik.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/bolidelobudovezozidexe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023d8a3cef---55764519611.pdfIn PDF document text
    • https://insp.biz/img/file/11980548408.pdfIn PDF document text
    • http://heureka-cz.eu/files/74478939383.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/92136614580.pdfIn PDF document text
    • http://goldmustang.com/files/files/wanofixafisomebujexusason.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613720ab24158---fefab.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/14541003837.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/55785450105.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vegikatevesuf.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/15765803790.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090307510873499.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bupijafatamupefirokofewu.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/legizekelutukepamuwonom.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/diwugegalirijoxep.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/51290461026.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/43924246485.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/muxasarutataw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/78c02eaba7f2f56cb96a624d41976be5/pepemipisoduwipubopegabi.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/20420914292.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613366bc4bba3---buwubitorekutanojesanor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=drag+rivals+3dPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 19512 bytes
SHA-256: 5d7ff865d1043e2965c11744046610195815c35791ec2acd36964df92a6ed22c
font_03_sfnt_off00013ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF5 10208 bytes
SHA-256: 777dd8415739b684356b8368cf2f45283777d0bc80818715ecdf1f2967e7f429

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