Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b66615944f617…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 23:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4280198c2ce71761a18d8d7ac18f961e SHA-1: 053bae6f91ba2ea0b60dc718896dbf459e48d1cb SHA-256: df7b66615944f61711ea29e559bda70d326bc5e0237a64b39c14bb32e49c1b3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://stillwaiting.org/userfiles/file/lufiwivowawube.pdf In PDF document text
    • http://jullien38.com/ressource/site-image/files/91258504808.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/2607188116.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132daf4b9623---posakeweribid.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/51614170938.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/darasupuj.pdfIn PDF document text
    • http://nature-revive.org/files/file/jivepujuzagav.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/59517537489.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fd57f58---susigaxobanejirikumumeza.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zotupetusajusutis.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/lorijowupazazedudanal.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8rdbvi1fe4trnlc4btgp2kgq20/vodubedo.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/luvipumabute.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/lekagexaludowinekep.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/bajadodumuvedo.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/30023125860.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/63434096165.pdfIn PDF document text
    • http://lizhechem.com/upload/files/43298426049.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/mewomevutoji.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/zepuwa.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/85993962796.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/86997937b0ef08558c8dc8639632f566/78576246903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=where+do+i+find+the+qr+code+on+my+androidPDF 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 17652 bytes
SHA-256: bc6a4f8ac9905b35228a4e661fe90977f96ee0322cfd455c84bff6d41c8104ad
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 10780 bytes
SHA-256: f924c716afb3385d9a7803400be0ad998b681b1849bb7cee0fbdbe29688fa16d
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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