Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc55b300ad44c106…

MALICIOUS

PDF

116.4 KB Created: 2021-06-26 06:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5ca7d32f80dd7779deb21cd25adf661c SHA-1: 51efa107876dffc406455d2a2e63536f3d3118ce SHA-256: dc55b300ad44c10668b2ccb3aa9d2579b495e21169cad597b933cb1e290b19a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a103545737dd5650f0ea84a99c2cdfa8/xanubukevu.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/547ad25e7044d31e313ba881dc4262d2/danatepogafuwikaronon.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607547f92d53f---98458236029.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dbd953bd496967119e1677bb4932ca14/pazilawukosotudoz.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ad48a4f28b35e8ede5cc181738db4d3d/gitinamidikejurupu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1999bef2c---wivazetoruzinoxu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04a007c3d---popovuguperewuwem.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160906633c9189---28444434647.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ourq9gsgaj8vhikpgacm5ts4mo/bezirobon.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/mizimodafufozasazotexi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fbe502a6625a668d88fd3e6af85ced68/77147947591.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kibukobef.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3cc61ba6d2b5412f69bf7c87577bd4d7/jator.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16648399816.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c35f2f84a62134805bc6c7161992b18b/47793388558.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/patibelukufigekixedanir.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/menimazepifaletazumajurez.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/38776929415.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609880389cc1c---povotebasojogefurivunixa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0c9a3d7fc28b5ae8bc77122881b10d9/wisinezedunowonilefug.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062301464389.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/jon3c4qfhrbiat6pqm2hqlefo5/79280727216.pdfIn PDF document text
    • http://matras-devison.com/upload/file/dilebipinaxepanewekojono.pdfIn PDF document text
    • https://fallsplat.se/file/laxalivabarurijakowiwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=microstructure+of+pure+ironPDF 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_off000162eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EB 19852 bytes
SHA-256: d4e19e333bd5528792e559d37fd65e084c385b83836815794303dce009a5801a
font_01_sfnt_off000194d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ace8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE8 10360 bytes
SHA-256: 21816f6b409284264fca4cce8fe88afbe0e1d0b235138acd9b4e16689efdaf1b