Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55492cfd0573a10…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 14:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 029da8c623de7eeb2cdb6f100132f391 SHA-1: 77ea0682a0053edbd42f531d848dbba00ea2b004 SHA-256: a55492cfd0573a10d88a85db8b567af5f0fd60d36b2215b95b8df68e43ea009f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. Although no scripts were extracted, the presence of numerous suspicious URLs strongly suggests the document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://print-resource.co.uk/ckfinder/userfiles/files/22036863004.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190b5d2538---45892144252.pdfIn PDF document text
    • http://kite-surf.sk/files/51318189143.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dowev.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/nanovikobetore.pdfIn PDF document text
    • https://huanghecables.com/d/files/60074607751.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9b8ca622fba8351e999012504f818aad/nawifosapezipolapulunoma.pdfIn PDF document text
    • http://intertravel.hu/_user/file/80700875024.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161437676bc376---90970681864.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/21016490088.pdfIn PDF document text
    • http://topflexsports.com/uploads/medunirobifinodenilop.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/86478355924.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/40340716795.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145429d4c03a---79110063734.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/puxojufivovaxoji.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/32417611686.pdfIn PDF document text
    • https://unaizahic.com/Files/files/12102005429.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/gadikolaj.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/50395428299.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021913127217523.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/kikakexozet.pdfIn PDF document text
    • http://hoangvan.vn/wp-content/uploads/files/laxukezupagolejagibor.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/detudofurilaguvuvoravi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=domino+higgs+versi+1.62PDF 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_off0000b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A7 10720 bytes
SHA-256: e382e03dd7810f6da7520c9b6ea863bedbb145cc2cc3b18bf845e92ce0a26ea8
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 16384 bytes
SHA-256: de2f4217f21942302b9c45b97a3c5a438fc21b14d6eed218d22c2ca0bf332d26
font_02_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1