Malicious PDF — malware analysis report

Static analysis result for SHA-256 10827df324536144…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 20:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed05a6e831b2ea08631af8076a040697 SHA-1: 2dc17cb1a432a064bdfe29ba13f0ae713b81e399 SHA-256: 10827df32453614455f3abd4fb519e29df0a582a0bbed4fa6af1145f3399cf5c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://albawadiroad.com/userfiles/files/711625921.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0ba980ab---94210820073.pdfIn PDF document text
    • http://fittbikese.hu/files/file/65420724511.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/96820704256.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/8874334551.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8cfc4f554---92417018600.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a644c3d04ea3020a874bb5bdbfc58457/84938157764.pdfIn PDF document text
    • https://tangente-mag.com/img/file/50204542114.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff196cc586---nigupomexorimenoneso.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/eb5557792ccf1eff5dcdb6e66fb6b81f/22445342843.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608890294556e---gidiwokuwedadi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f405c39ce---25261113404.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc92475477---17369977321.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/muninepebex.pdfIn PDF document text
    • http://xtra360.net/campannas/file/73982343133.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapomix.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8el5b9od91d4odvqcs3sa4eq95/degijalugotemuzopeg.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tidozebon.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/wolelisu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/wegemitugavorugiwiga.pdfIn PDF document text
    • http://dgjst.com/upfile/file/runawemenerigaj.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/wesekasu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e481aea9de---lidapoxilevigopinejuzoto.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6806ea5be5---gajujejep.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/9581102377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=complete+subject+worksheetsPDF 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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 10860 bytes
SHA-256: faa31c0c6d650e0168cd22404c3bcf9f707c699837becfa384841d9ddedc3074
font_01_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 17724 bytes
SHA-256: bd16be0122845003bf7d8b568a793d87782a84dbef4d3e041cafe11f7302e71d

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