Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f99bbc838bcca67…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 11:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7e9c5b09e8c3714ff6908afc228d59f SHA-1: 1d5c654c5c7773c76fc4ac51b2a08ef414b5a80c SHA-256: 9f99bbc838bcca67f5719f7bd31a8d479eae2126b8b9ca877795b15f2eb9dc30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the 'link farm' findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=map+hack+ml+2020+apk+download PDF link annotation
    • http://tianlanlawyer.com/filespath/files/20210904050848.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/verumejufeb.pdfIn PDF document text
    • http://jawarakreasi.com/file/69413797563.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/64085483557.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/navevebetitilomevemadeku.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8236426fdfb6842dfd9a075566112dc1/nujumofofafobuxigu.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/nulazaruvox.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/mojafatipesadefuredet.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/45302895812.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/lagipunisezogirokelu.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/19922001872.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4c16a6c2fda8fd823d6f27be89178d35/30922331842.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/8649554293.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/50461118067.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/1119243144.pdfIn PDF document text
    • http://kammed.com/userfiles/file/88609751417.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/diribavotovi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59675a85---getubemibitiruxedolegesun.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/15052688038.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/95870486803.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/91058319686.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepoguvimajizepok.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/wonozodupemivusixaganojus.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/60103625092.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/xarimexorixamidujonibame.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/pegabosejukawavikanog.pdfIn PDF document text
    • 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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 10604 bytes
SHA-256: 968945c4b9c2feba6032c22d45a9e7174f431fbde7ca3cfffc744202037a2c8c
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 18208 bytes
SHA-256: 4eb696dffad0367f58e486b9eb80edd9bb70912c67a8834c2e1ea8cab5f86bc6