Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b6e4fb0a29d83…

MALICIOUS

PDF

100.7 KB Created: 2021-07-06 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b1cfb905c13ae4a47a13d8ff5ba692a SHA-1: e01ddc577311bf4969661ef4a1d60035a0bc46b0 SHA-256: f00b6e4fb0a29d83a739d5711ac4c5ebc2b3a4a85e874c009293f4e43c29d95a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also hosts a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amon-syotengai.com/userfiles/file/mebewore.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1546a98c---97686640845.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6731ca771fbeca1aec83819b24348d53/nefaloberebaruwok.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d84f5bc7b9---xozopux.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ff6fdf0f5b665ea67115a24a8a4ab208/85215529994.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2da37a1b6---fajevalogudujuderagiriw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b57516b4eaf---webitiwuvowoxizorovu.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/46880850927.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8f6ab9e9c---liruwum.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b13f820fad---nufufavewixikedonaju.pdfPDF link annotation
    • https://pharmnet.cz/ckfiles/files/files/85100457835.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081328208243---98774923178.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b8cef571---newugokategozuwigugu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bda9ac505024aa7fca609d0a9b028620/27663772481.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/32800817302.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bumuvivinokulinemavak.pdfIn PDF document text
    • http://mobilenmr.com/files/files/43754145404.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/954e426026ecdf391e5d99a8f1958f40/28217383554.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/62c770f592daa12a7772a3548c9ba6f2/50086823754.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/73126084852.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gdba8ppnl07pt824dgs4ceh10r/novivonumusav.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/76759581593.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d5da2ee7fc6aedb6e5ca5d308f6ef9c1/47227151081.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/giwelawalegosomopipinesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tap+changing+transformers+are+employed+forPDF 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_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 17604 bytes
SHA-256: e3da16bada3afd5f667347fb83ce7e1dcf958b9fbfae1d15b723e3cd1f430230
font_01_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D1 11144 bytes
SHA-256: c6111bc5f1fe9d5f7ade7e844b004fa09c93803e155f8b7fb23cb2c53b6d33c3

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