Malicious PDF — malware analysis report

Static analysis result for SHA-256 71021c51cf42613b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 04:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 404f52ef9b957b48a19fc13fd3aa99df SHA-1: 23d39cdf50962d3621472bbf74b8ca92adcca403 SHA-256: 71021c51cf42613b8ee9b8e72fee24da7a5bb23b18f3e78b6bd6e8fdf98e46bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to lure users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/51430611239.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c7336e0---49911876185.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/fedumekipakijisagova.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/56684882422.pdfIn PDF document text
    • http://hbaoge.com/upload/files/86845591048.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/jabipova.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/23363490551.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/74286271390.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fcd26eda1---lenazebelokatanaranod.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rqqrhmaqoump2mc64umari1oc5/meveviladusatipezikotozam.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/50259623951.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/695742724.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/mewumanuvobogaxepuratel.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wetasoliv.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/pudijemudet.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/mozipatufogegipedulegawu.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/75614126401.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905101734.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/tifal.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea005ebcc---34922025183.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nivokejodovugafugumi.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/kevikodu.pdfIn PDF document text
    • http://mounceconstruction.com/userfiles/file/68449577530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=descendants+full+movie+1PDF 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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 10756 bytes
SHA-256: 56fd3f4d8a09295ad1bb3db5122f632c048440b51e1172c77a4490c409be9ff3
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 16380 bytes
SHA-256: c81f93c0e90a4e0e9621abe7c5dc72558aad9ce786c867f82526a330b08889c4

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