Malicious PDF — malware analysis report

Static analysis result for SHA-256 effc28a32ae4ca4d…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c3b21311233643e73eed76f03255ffb3 SHA-1: cf469396815008174ede9926f1526a22921cce86 SHA-256: effc28a32ae4ca4d8d6a8a2d22c5fc9d033ec7d9f1ecfefcdd617ea2ac12fd85
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous external URIs and is structured as a link farm, with several pointing to compromised WordPress upload directories. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=form+iv+star+wars PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491285b90d4---40817997472.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/40440796707.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/72503839869.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/mefelalan.pdfIn PDF document text
    • https://franchisevisions.com/broker-site/files/files/75280888228.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/28e4b59905067032fcda00835afa1dfc/56961763059.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/tezezoruxiw.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jabipivafuzulasopiz.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/45355698388.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/muregijonujopa.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/16111224118.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lukudigurador.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/bufadak.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/xalokebuxewidapasi.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/tefikafokedigokezopu.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/wigufej.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/bixovak.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/11213630623.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135429c2210b---72777626533.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629c03391---93545515447.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/rizavixazo.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/56151185747.pdfIn PDF document text
    • https://novitas.ro/files/vizakeda.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/zipuxemuwe.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/piboz.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_off0000af6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 10116 bytes
SHA-256: 71f2292ed3ead37e06e0c012678ce9675e7c4b678fbad24b94c817ba7607eb16
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 14416 bytes
SHA-256: 91df3822dd798d68333a86ed0852c34c50241dadf67eedbf0dd9119afd0c6a1e
font_02_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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