Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45bea5dde3a29a3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 23:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7011817156a0f8740b1b2e12d1dbf8c4 SHA-1: d3e5609e1fe9c965a0db0495d21cd93e64add1ed SHA-256: c45bea5dde3a29a389f68cd06179ea74477f6cda9f1262e75722f7eb73be79ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, but the extensive use of external URLs is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://medvor.ru/uplcv?utm_term=wifi+adapter+app+for+android PDF link annotation
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xiwebinemup.pdfIn PDF document text
    • http://th-hl.com///upload/files/43317436390.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/zukix.pdfIn PDF document text
    • http://labsshop.com/d/files/dizitipazaruxuz.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/85838654576.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/81225011265.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/42569601782.pdfIn PDF document text
    • http://wdnederland.nl/file/62048954677.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///13788014609.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/54720756818.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e92cd7706f1242c2aa48cea6f1f1ff9b/62701343409.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ios3v2qkmtfaepr7oiiad0a226/pubipesimi.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/52607159615.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/1369507819.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/74567021723.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sikcdcfrae7g943is92tq43dgv/wokoxixamaseximuwed.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134356278cb2---tunikuvufirebunoxiwe.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/80039933453.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/zafiwamogode.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/magusenuwo.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kaxezirumu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/45987659061.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/tujugekabusaxejuvisakabos.pdfIn 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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 10268 bytes
SHA-256: 7edb66fe1f19131df23986800caef55dbe3bcb25fe33f507b6df20fff8108eea
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1