Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb03a5c97f45ad1…

MALICIOUS

PDF

93.2 KB Created: 2021-07-20 11:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 816463d7c47c3387490d16a40b2e2c32 SHA-1: a96c977bae587f3f4cff2b5b18d6055f332603d9 SHA-256: 7eb03a5c97f45ad156936b6b719116f49f29b7fa20163bdd4985d27aaa5ee317
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body was heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073864cb10fc---rovexusubivamoseso.pdf In PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/20276537647.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/63563708426.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/49146225723.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c22d658548f261ededc4953c87bb1a0c/19767404612.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/suxajoxijejevojutuzetup.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/32044485313.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8d8458e2---sofubozujozaxadopu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/biborolosukadobuximan.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d85638d19e3---xonadepubokefubefe.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/varorapoka.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q3u3mcv1rbaosvb4gv9er7n7e4/84294629917.pdfIn PDF document text
    • http://beta-rc.com/upload/files/98671941815.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092f96b8d4fc---givopo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gexajalosojesewofu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2mblncosa7o9i4quhqo2lrnkl1/lupejotedatumakoka.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b835e6e71ddf1b35cd04ec5e65195230/zivaperuk.pdfIn PDF document text
    • https://fultoys.com/userfiles/36860918610.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/52b7e492eb200877488face429c82699/73348577214.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3258199c8---peralojisajexatisunavot.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/vaxubexanukov.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/44228204630.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb48dd046---49236530367.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/weridefowiwovagibuwabila.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626097121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=im+stone+cold+in+love+with+you+lyricsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 17808 bytes
SHA-256: 1de559c72c7c6f81e3ac6105e8dbf516c9701ed7e3ad91f6a47e4873700de9a3
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 10788 bytes
SHA-256: 025e03ec41bb07db4131a142e0163dd51e70c374453b467130447357094b56e0
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 18496 bytes
SHA-256: a4bb1f61bc1fbff178b561c606422464092d1d4d32f202198e62dd364ee1f63b