Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca48c8a47bb23f7…

MALICIOUS

PDF

89.6 KB Created: 2021-07-03 06:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f0affe78954d5f548de0f3b7242779b SHA-1: c8cf0c32ea1624b8017067f1038fe19f3eae8437 SHA-256: fca48c8a47bb23f7c40ac6594c300a77fa0d81aadaeeff6717759e5c9b982af9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure align with techniques used to deliver secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://toyteepee.com/uploadfiles/file/210511040023701314hfz72a.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nelidedid.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64jalbchjg185btqr3n8aa02t/9504395916.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/95b0ec8e9ee0a31d2ed4cdfdd8b599c1/depirizov.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/66246512ef465a575f9539282b48257e/wopejeribufumogo.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106091830235832.pdf
    • http://dichvuwebsites.com/media/ftp/file/23440224949.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/47903176861.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cac47dc5f86---27108916900.pdf
    • https://drvishweshwari.in/userfiles/file/rusutofavuwatewalosuteraz.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c538fc335b5bb2139ee814c053ed257/62673021575.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ce77e108---33218410559.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/85911345047.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c1994197b62ba8ab1e9eae09f673ec9b/88395113853.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9640ea680---vejomuxonanemoxodevomi.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/nikijugekumud.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a466b6a03cd---gebibadu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e808703a68aba97b643a136073aaa61/44735075140.pdf
    • http://driver-jazda.pl/upload/file/45795181933.pdf
    • http://domeinbeverdonk.be/assets/files/file/33256764073.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d65b8ac9412aefc795ee7d4c308fa1ca/tijidepuna.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/eabfe4a48b3c56e29e6238f7516a0810/33822772848.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2ad4a54007895224f68a5ee370135548/49983091102.pdf
    • http://be-now.pl/userfiles/file/majimeberufulubelime.pdf
    • http://charivne.info/images/file/4630528270.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fc31b996f62a3eb1d43a3373fac71ff/pozowiwosipawujurujum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=use+of+epidemiology+ppt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 16792 bytes
font_01_sfnt_off00011391.bin
bc78a985beab73319e8ed0c629b0f5e2b0f95626cacbc6835675d29b5f6b4633
pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 10596 bytes
font_02_sfnt_off00012b98.bin
2e69df986c039ef106ba255abd5146bcc37ac2e52c8f44904238f1dbc92b16e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 17344 bytes