Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb847fba655a588…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 15:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 260bdc5191af9dd2b89d745a3dcf8804 SHA-1: bd426876231c74f0e54c1a5a6985e91820d423dc SHA-256: 7fb847fba655a588307cea22a3c86eee5e65715b87b1840f012916ee5fb2fd0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic further support a phishing or scam lure. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=how+to+share+apk+via+bluetooth PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae0d129e41---konetapabufa.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a7fd405121414fbe9614fc2e8c01ccf1/wamoloxepemeto.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/68289437492.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/97305386329.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/davoxeninofufaliketito.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be4b3bb0881c0a5af5b3f7927d60b54c/renilajir.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0b11cac0---48033291525.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/96322334620.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/vigewekubijajidivuba.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/kukofisu.pdfIn PDF document text
    • https://windsbs.biz/files/file/kenonovatir.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/27611503885.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911181008-xukugefa.pdfIn PDF document text
    • http://compsult.net/userfiles/file/72477317500.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109181430392307.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/umus2qd2n4dv4199qlhrtqm511/89048047671.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wumedupox.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/66020031972.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/wutudepadenap.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/91645056472.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/fikanusagitot.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/92871325178.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/96600923117.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afd8757dc9---riketokedumuzikanige.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10720 bytes
SHA-256: 071f5c6bf50d9d345ae6ec8c4987e20a7430dc2ead0d1af7a4c8e36db5772f3c
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 17264 bytes
SHA-256: 74b11a006c906e5096dae2f7bbd434663c85eb4a585c9de0898e148e5ddb195a

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