Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9ade80e99eff21…

MALICIOUS

PDF

94.2 KB Created: 2021-07-06 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1641f2cab6c89b7385560223656e8078 SHA-1: c9cdf36d527133072a4f1982635ae2bf24b97f23 SHA-256: ff9ade80e99eff214cd526d0da170edd14ce37a95817e600081590b1cc3208fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5b7debfbe1bd2b9043e14ad5fb7a2075/50205648203.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f1fd5a7f7---81672436109.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/goribujakunenapaditafa.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/14038556238.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gufidekebuv.pdfIn PDF document text
    • https://grancom.by/upload/docs/10164214069.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/megonolazutex.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xugadufafekovesuxirosavi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/geviderububuxe.pdfIn PDF document text
    • http://cichanski.com/Upload/file/5070170099.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/1731807817.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/75250668938.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/74aa2fb5ba83aa8f57d3ba7ea8b100d0/nonug.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c08da052---vanoz.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/sudegetu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/05db41645e6eaa4e35257d61b131d97c/dogejoruroxomaxuvivakikov.pdfIn PDF document text
    • http://www.centralperdana.com/file/70993401012.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/25948601273.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/76921888203.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/51144664529.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/45790516525.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/razogoge.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/af4a5796d7542cc7e3bd2b4cb7c75eeb/573499272.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/lobotesusiwujibetuk.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/fdd82760e5d6dd64f5ddf31e7425439e/24993604557.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ee6e376f---73705550592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pictures+of+fade+haircutsPDF 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_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 10524 bytes
SHA-256: 7da4038af2a9787de210a955f8f434b2b1bacf81f32a036ee43752c8d4262e68
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16840 bytes
SHA-256: dd4f47ab39572ba94d46c3665c28edc54e63cfe3b361c3bfbeca35750456b603

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