Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d6f09d08858a94…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91d1c691b246ba7bc21ac48eb09700ad SHA-1: 96fd93723c43b78a36769613067c6a13d868d5a6 SHA-256: 26d6f09d08858a94a24324c20a4e0d7b4687f83a7354ccb53280080cdf319846
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 ML classifiers indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, such as http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/02dc62962352f4804021ef91150d3253/tipikanexufalopumuwewe.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/pidudorujojivewefikirifog.pdf In PDF document text
    • https://biomedchita.ru/imeg_master/file/30876689589.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/rutakiwirufopuketas.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hp7pkgkmrc61npr1k0u13p28nh/54133646424.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e71da8d66---xexon.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/votovuxixusakovog.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/gogepagafixixu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/81565517099.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1e5f98442f458dabb1876598ff6c6402/33704178634.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eb47b45770c6f829487764cafa503a4c/xibiluzokewekozemej.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbcf878b94b3c97b9184f20b14437413/wujelawuw.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893c5e32cc1---jazunuwomezupijudu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/1fccddf796a5ee4815975568ae5a3bcf/nojamuderaj.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/torimogebij.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zevifogovumurabevel.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/02dc62962352f4804021ef91150d3253/tipikanexufalopumuwewe.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/velupazulekatu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e397e99fc0---93166387081.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/vanisosobunifupaxa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tedap.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///84460497241.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3c6ba49e3---44842745174.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/votuxoraga.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/rezasetemavarepudusule.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d526c1a255c00ebb9863c5e418e07a85/papewawapolilajabexoxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=itinerario+nell%27arte+5+versione+gialla+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_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 17904 bytes
SHA-256: a87ea14f84f628b4200e3a345a02438e4be0f84a642e663f65b7d806a3fc5c63
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 10856 bytes
SHA-256: 44d878145c9b1b28921478585b63ddd43fb06adf291c2e017d8783a8d67362ab