Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db733c7d7aa9d9…

MALICIOUS

PDF

82.8 KB Created: 2021-10-04 16:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13af4983241a1be83c0760ba6781a88c SHA-1: 4aba031bbccbd1050d05d3651beefb6ef33c1170 SHA-256: 85db733c7d7aa9d9bf2886ccc850dad29f27317a929971c4e7dc53a213c42662
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various external sites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic, aiming to lure users to download potentially harmful content or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=ld+player+emulator+latest+version+download+for+pc PDF link annotation
    • http://aucoindeshalles.fr/menu/file/pirefezexu.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/dekoruwi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/86509131925.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxamudekuzorigowoseped.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbafb17e95---fepevikilebojufaxabigute.pdfIn PDF document text
    • http://darstin.com/userfiles/files/6080781053.pdfIn PDF document text
    • http://woykoff.hu/upload/file/42480087261.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kubawovejilofemin.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/rugape.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/lodavi.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210903183426.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vowubanuzudivazek.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/97663256597.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/sefug.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/dawigoroxot.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/36438398481.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/34183151645.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebcf80dba---79413025688.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0f7239eba8ae8d192f367063091cc638/80696244044.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gedem.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615339ca0973d---mogutulelegure.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/40428541488.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/82397720715.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/rutek.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sinetejosakesiragefep.pdfIn PDF document text
    • 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 11104 bytes
SHA-256: 62e8781fe9006c7108506370b706815c1a3e7c290ce8c26b1debdb599c12f93f
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 19160 bytes
SHA-256: d39049a6bab8b87396b76865f1b9ddcb2ef67f147717b5300f015b15e163c8c2

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