Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b68d05003dad18…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 22:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7fbe0d4a90ff3fbd4a4ff9d16e3dd73 SHA-1: 3142dc359dcf2e3ea8f3367237b3f7afbea05f13 SHA-256: c6b68d05003dad187fd41bd1c7d37e4d4a6f44ec0232d4d33e9c3796dae88b61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed for SEO poisoning to lure victims. The embedded URLs and the nature of the heuristics point towards a phishing attempt disguised as a technical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=laptop+battery+charging+circuit+diagram+pdf PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b12927c6f8f---60540382775.pdfIn PDF document text
    • http://chipgene.com/image/files/20210904_042402.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/84821072898.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/11691060953.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986b368b8c2---nelasubumafavite.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347ec6c3b79---73378537407.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/gepax.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/73706816978.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeea0e743---35950449706.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/wazabuzasagiwakobukija.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210724_184358.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/74734516249.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607784e2c72c5---kezuzizasumudop.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tst39df1c6s9862i8jimbb5beu/jiwivinele.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/95612017451.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096605286379---50905811724.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/61703346020.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/86046774256.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e70a46dc434---82487403460.pdfIn PDF document text
    • http://goref.ru/files/file/15944610713.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/fevobade.pdfIn 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://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_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 17604 bytes
SHA-256: 17feb3634c5bf40c8d470b0e8cfd58c3c594577de754eb7e6cafb2d864ae9381
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 11164 bytes
SHA-256: aa8e15e274a9fe5fc3a5f64bfe49411b8aa432ce8bed8ab36c1ee460991e4915

Open this report in the interactive analyzer, or submit your own file for analysis.