Malicious PDF — malware analysis report

Static analysis result for SHA-256 87efac2b7b1ac872…

MALICIOUS

PDF

91.8 KB Created: 2021-08-17 11:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bde9cc900cb303e55a2bbf93fb7cb27 SHA-1: 5372dc7bfc543a664b41ee612eefba70868fedd8 SHA-256: 87efac2b7b1ac8722172fe082bf867ccec4c8753cbdac51024c753df3f18857e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised WordPress sites, indicating a likely attempt to distribute malware or conduct phishing. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the ClamAV detection as Pdf.Phishing.Trojan point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb2abcbba---vivumuwakifinasofexazukok.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/63875ab9b962884a2fdd08d029b79a82/44089498104.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/754598f73948247e25ef3c34e3fca991/90958070842.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/rujojupapojojetadajo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gawafuzoxomakenu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae0d825300---tawizebe.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd393a129e0---26653012736.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/musisebezukazabote.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/pazeputaruzewo.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/penebabulipopi.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/riworugizofibifi.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/13284139861.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30c806939---gexuwikafimerabuxojo.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b61b5668a37---saroxibimirefi.pdfIn PDF document text
    • http://fructusartis.com/i/File/lubatapululizunikutosaxud.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/27477449905.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/wamikujumugero.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c264c688d---93263799274.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/lugojan.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52234cc5a3---18316414296.pdfIn PDF document text
    • https://kapefashion.com/files/files/bakefazag.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c17f97032---muromipiv.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084aea9e50e7---63875625856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=who+is+raziel+the+archangelPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 18372 bytes
SHA-256: 5bcd0e491c50861800b4e60d50d5c130b1b452bb9d171e027ea58c63eb524c30
font_02_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 10564 bytes
SHA-256: 166cc86f31c2bc1d215a38fad5221b14c49be157d4f2066a23aee25d01ecafd4
font_03_sfnt_off00014554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14554 17884 bytes
SHA-256: 40d072923735301ad531cb835e93c67917e6ea735e7acce9f9d861b1c64a366c

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