Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2acf3c9c373eba…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 01:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb1ba597cd8b8b2e3fbdc2bd5aa5d9d5 SHA-1: bff3eb38cf8969e9ae551fb571cfbc8a277e6844 SHA-256: fc2acf3c9c373ebaea8baa5c42f265a8b0d54a4aa0adc10de793e85b0a667cb3
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb9a79471---tifurage.pdf In PDF document text
    • https://austarpharma.com/upload/files/godesi.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/delafakugosajixewikuda.pdfIn PDF document text
    • https://esvigo.com/upload/files/5029776350.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/81097579527.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jirepabibetotirefaza.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/c7aaeabbfff100727bd45cb9e429d9a9/vaduse.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e5ou97hgr8j2iuec16ko188rqg/51164855139.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e5e9ed31---32540786516.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cd95e1b2b877cc472954a643735d8964/15197677844.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071901e7e049---47491222055.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/26080096404.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/69888385844.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defd4c69cea---7643588191.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/feneliwosuvof.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/vvasref2csq05ki2gu2i2smg7s/47106501213.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb3d827df---52692066371.pdfIn PDF document text
    • http://tyextractor.com/d/files/lajaduxisinujenasenigo.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/zerugapovozorosoputedob.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/favozenuriwefevegofu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725ad6f3ce8---24060959314.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e925e800---kukidimibibaxinivek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+pixelmon+on+minecraft+iosPDF 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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 11000 bytes
SHA-256: 281800b44aae4ebdda1cc24b6abaec1b0a0977b4ce8b899d2cecfea8d2265bd8
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 19376 bytes
SHA-256: 21b9a39ded488396bce6613ffde5974376cd5025ad413ae2095dcd95badaa43d

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