Malicious PDF — malware analysis report

Static analysis result for SHA-256 40add4263a11b492…

MALICIOUS

PDF

173.1 KB Created: 2021-06-12 15:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a1ff2c1540e62117e3c83712a582fb05 SHA-1: 6602042c62f60ae2ec8fe8f5e3ed504d5dd51f5e SHA-256: 40add4263a11b49202ea7da83815e981d3d95cbac3022f775ff0a7dae52d7bca
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=crisis+on+infinite+earths+television+series PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/567d466f1c8314b3f73ce8c8bbca6039/45649378762.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3131380b93---sagoretapuwafowogarogole.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5823467300fae19b283344e0ba0e0302/pesomobevin.pdfIn PDF document text
    • https://asi-filter.pl/files/file/buluk.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160767f3eafabd---95170305624.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078690fd6115---88905977233.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/66971949654.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/zewigujuwirobop.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/r2pkb8n7cbcpg4cjis6a6bks1s/zepevatavekup.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/xazovujenininixilixez.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0a13jesg2hrvq8ulr7r7l619q6/23971939369.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556e548eb4---fixejubafumino.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/vafupamikatopepe.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/sepemakomezafeb.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fumunadaninijazogipew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000254c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254C8 4820 bytes
SHA-256: 0e9be4b85b9e09f852ad9bd9fcc48913abd33f693bd9694b26a554e4c719ab69
font_01_sfnt_off00026525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26525 12900 bytes
SHA-256: 4cf1f0941fdc4779a7327871c0bbc9b8bddaa5f9a0be06d9b914b8e3c37934da
font_02_sfnt_off00029077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29077 16344 bytes
SHA-256: dc620336aa769c766927a552749f6283a30952bf3238451f386faf844582b0a6