Malicious PDF — malware analysis report

Static analysis result for SHA-256 48df54c9b02566cd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 11:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e56d310b87604724b715dee3149376e SHA-1: cb9d26029d609f3a1b6fca543dca55d2543f8605 SHA-256: 48df54c9b02566cdd67f947b75776cb5f7697c1071ee47d08c184853403b2ba8
196 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and exhibits characteristics of a social engineering lure, specifically prompting the user to install a browser extension or update. This is supported by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document also contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the nature of the lure and the presence of external links indicate a high likelihood of malicious intent, potentially involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=kantipur+font+for+android PDF link annotation
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/wewemuxodanofirur.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/90683410093.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/kebilu.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/pavufedixirotoj.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6c1143545a8509348837ee259a3475e0/1814143625.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jitige.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/70743674208.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jigiriwogogaxile.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/60192070677.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/zekibenupefurexagisebi.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/46336875156.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/92413521470.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/foroduvexipupoko.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/nemeludubugopimexas.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/veraxuluzager.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b639690229---9153121244.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3cc6020caec8c2d6766ea07094c7c1a6/15717847823.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/29217684916.pdfIn PDF document text
    • http://goldia.cz/data/file/tozujewuvumunidef.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/xizerumiminikirefanip.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/41918013595.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/fedobozagalari.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/46205806136.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/10347192127.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/56484373341.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 10236 bytes
SHA-256: 8dc9cc8714e628e8ee1f243b0d61aef4bd19276a48ede54563fe7182244e46c2
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 19340 bytes
SHA-256: ab98b80e7b385a73bb3730ec4e2683e93caf55aae45a3a76840b2fbc00c51972
font_02_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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