Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb079e410062ea47…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 08:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7233ea1c038337d8e4171bb6928e6b51 SHA-1: 66aa2ec3a648588c77913ab31a9ce66709917691 SHA-256: bb079e410062ea47e7665ab669b1a3942dd13801cf6a5a748307eea77615a8f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly indicate the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/33445423792.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/renonamevimejebo.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/mided.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5815c9ac---26044167226.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/vakabitepejoko.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4f6e63fadbe8199581ef52d117aa235f/69800868294.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xudavidilijazos.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/55010121535.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/maxuwa.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/66429009890.pdfIn PDF document text
    • https://protum.se/file/35914367657.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9c2df110---59252755545.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/galenifupediloxofikifex.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/15248025483.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/fisemebesirufilidinir.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/gebisogigerugus.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/dajapowopuvexuxebavavedi.pdfIn PDF document text
    • http://gewald.ru/content/Files/nugewetiwetesedukin.pdfIn PDF document text
    • http://megalaserasia.com/upload///87631347806.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327b7a98021---temadijilirolud.pdfIn PDF document text
    • http://frchem.cn/upload/files/fifukepavulirorenaxupomab.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c4dd58d4d04f3ea8b2c65bcfccc3fd34/66926545307.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/39243020136.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/xinojezakobosuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=logiciel+pour+telecharger+application+android+sur+pcPDF 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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 18660 bytes
SHA-256: e8a7da18408b1d939431b5ad12f4f672807130e2c73f3950daa2b92d24ec06e2
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 10852 bytes
SHA-256: cffa2361b159b18b9f3d6a4e734f7373dd25ae94584b53ef352945fc692503b8