Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1187f1fc9d04e1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 10:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08046f0c20b63aa23bdba0c2602d8e0a SHA-1: 00eaf92ce851a1a2bcdbc83a29f94dd8cd3f128a SHA-256: ac1187f1fc9d04e142f4c5316b9744bc24d7ef4c625c007f53937b859c0391d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=ott+tv+box+m8s+firmware+update PDF link annotation
    • http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/pirasejanewowusozol.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/magojumaturova.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/jonipuxalefa.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/2888125195.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210916_101753_199.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2893ad3d29e3cb55c864aa870d8bd7/vujajixerafivujewibut.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/37925537521.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/49541425834.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EFB657029A404061.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/71586135537.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133edd632a4f---veminiwetiwisege.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/35167664314.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/wuremek.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/20805332732.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/28141402263.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/49101492605.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/96747098475.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e78e5b63f---55768805388.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/xejojezelafodevatusifojux.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vemakurabovoja.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/fuverurewulit.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xikugu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/nuresixudotapeleni.pdfIn PDF document text
    • https://cncunse.com/d/files/53838077441.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 11236 bytes
SHA-256: 7d05fb53ad6142710365efb88a7cf63607ef2c0a3fe6302541deedf6c6d7fca1
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 18060 bytes
SHA-256: 33fae08702ec861b3ed766f0afd9134b4693bbfcf6ce80fa195010dd3341c941
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.