Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7dd684c8e01a77…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 09:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 681e2986900ba4d9952e302d926b5812 SHA-1: 91e2a5999d455a6888fdaf3e6d847c9df54e82d0 SHA-256: 1e7dd684c8e01a77d7c5afe1b41039793d4c275720965982f8132fcc7c4b23b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p9vboo09am3hpi460on3te5qd4/29085863178.pdf In PDF document text
    • https://thisissati.com/userfiles/files/medipikaxej.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/batodolakodisipevuru.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e47db0d4---67032144736.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/24509251825.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d78f0c6c---wuzonukizodibuwe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092f36724c11---4144384745.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zinewakizawomelezo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/948319b982cf5fb48f1a5441f986c440/zorikuleminirova.pdfIn PDF document text
    • https://dintek.eu/uploads/file/galekozotarutejenapar.pdfIn PDF document text
    • http://goref.ru/files/file/52053264323.pdfIn PDF document text
    • http://kfbi.ru/content/file/79188784315.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b8484fba---tibazagun.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/35569592379.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/bipiredenuterujuzimiko.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed98a6ab2---fopuwit.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jizitujefovinafew.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/welidike.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/rijodexujadiwawetizi.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210803172633.pdfIn PDF document text
    • http://goref.ru/files/file/rewelowelujinal.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae97a36e3---fubupupesegitujonafuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=amelie+soundtrack+piano+pdfPDF 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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 18924 bytes
SHA-256: 3d120635b78a03b2778af97bcd29d65d3f5693398e17307c28b072fce2b5517f
font_01_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 10952 bytes
SHA-256: 6d59b604b6bcbaf87a3d6becb5b5d35477458462cee0c92144faa57d8bf208d2
font_02_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1