Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f444f4e15466b51…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 18:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 517a9fa3df6e881ceec09aea0cf021d5 SHA-1: 111378f67f8b55b3de47dcc9904bd7caad19a61d SHA-256: 5f444f4e15466b51886fc108fd8f75055ffb4f13de91bee39bf7af47d4b14b8f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains phishing content. The file functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://banghaija.com/userfiles/file/votipexawuvoxe.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15cfea41ea---62130706442.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/xezumeterewikotikijazozit.pdf
    • http://sam-global.info/files/file/68588140659.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/joruselugaka.pdf
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/rikekudiruritavosomut.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16091d27c94a71---3163034738.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lupj2423lg836icqskkffek6ob/pemifi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609553668f395---vumafozulob.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae0fd77e0---kadizanuduxeki.pdf
    • http://serenetour.com/image/upload/File/vutov.pdf
    • http://pinetreerealty.ca/clients/55933/File/34780771585.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/50301948192.pdf
    • http://epilia.com/upload/FCKEditorfile/25744709660.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3onp4ggi8hpttld6kj3g9uma5o/66683048212.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a79c4135adcaba04698fd24e167641c/88197704543.pdf
    • http://szhlfz.net/upload/25398250567.pdf
    • http://kayamedbursa.com/userfiles/file/38581493908.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/81420998137.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087587e5c5f5---pipazoxoxosewexo.pdf
    • http://sequirk.ie/userfiles/file/selimav.pdf
    • https://chaletsuenodesol.de/files/zotowigawufasonu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/56b898af16af5f6ffbfd8880f1458238/24595713432.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=krishna+series+on+analytical+solid+geometry+pdf
    • 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_off0000f450.bin
f3c85477cb829240ea95f161ba718240f41f18215d5d5bbcf80950b36e4f1d50
pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 11172 bytes
font_01_sfnt_off00010e0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 16792 bytes
font_02_sfnt_off0001261e.bin
9e55d8ba959390c572ecdaecc09cf8b844e1979d3855fcb840bbb4135e38924e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 19008 bytes