Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b49b7889231d20…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 20:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b8d6db9095f712bce3389031410fd6e SHA-1: 97dea1ad1242d53d60a4d69a8fbc6e54c657ee29 SHA-256: 32b49b7889231d207a67ff96674878a43e449d98c6b43caa2d170d7140071067
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The file's structure as a link farm on disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://savemaxint.com/files/file/99029464866.pdf In PDF document text
    • https://ultralloy.net/upload/files/52863710063.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fc3dba14c52420fa7aebce3d2283c32/fasoxefetagadoxo.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/rukesufiravobexenaje.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/35128962585.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/22659620532.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/3060712884.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vfmi33c5fstagpm6dcua0snmd1/27873464885.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e645d1a78c---33494798630.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e0ada1d547a8835ce420d492092c9ff5/nenaxijawajuneb.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/82860170916.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/78017077686.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/65086389619.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/49041954227.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/e6c415e0939bc6fffb9b9f9f3dcb5c96/32865776184.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/xerozabe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o977j30gfe2qe0q8ighgrlipmj/gebebibovafizemis.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/fonujodixawokolebinubosok.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13217dc2a---79185212113.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/84354193353.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078df801653e---17593664342.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/49lt638u6tal7drd2d9tqrrqsg/gilusazi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kofitisisala.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xaxifefa.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/finevunurodetuzikuzuxelax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ecology+and+environmental+science+pdfPDF 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 15588 bytes
SHA-256: d4870ce276289805c520e87cd06c5801cc5acf24193099b4a2213ea7cfae941c
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 11128 bytes
SHA-256: c3fedc632dd391b4012ec71ad78ec6c385a097144052e1753427a77b48ca40d7