Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c7b98c1ad67b27…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 16:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c7e4d4db89bd8f97e2590e9202dec06 SHA-1: 4ad5b800a26548c2ae59683b1bab1e1732333775 SHA-256: d4c7b98c1ad67b274e739a69fe192ce00b90d88f2f8ebe20a8a7e2d096c7d1e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or references to executable content, further supporting a malicious purpose. While no scripts were explicitly extracted, the nature of the link farm and the detection results suggest it is likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjmjehnflsqhef1a0vlpac38fe/zenazubawa.pdf In PDF document text
    • http://praguetransfer.com/files/file/najezaxukirik.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58357913f---wepupuxazaguwotag.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/kerajugixuvomofen.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zadafitasebom.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/kepadewakumavazowuku.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/44147138165.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/14053347832.pdfIn PDF document text
    • http://stromzeleny.cz/file/rixaxokinujumufu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/xejurotureruvosijef.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/pobakalulegemazunuvosufuf.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/85926615803.pdfIn macro / runtime command snippet
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614620425b0c6---58721310073.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/dedewotewadekazevowuwir.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/71005096085.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/92370338547.pdfIn PDF document text
    • https://paradigma.bg/uf/file/xikafijibitoxik.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/33669360783.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/31332287365.pdfIn PDF document text
    • http://ingegnerIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=things+invented+in+ancient+chinaPDF link annotation
    • 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 16504 bytes
SHA-256: 209b1436e4407241433024bb3c3b2874826070fbbbd593f2e1805a49678a2d58
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10412 bytes
SHA-256: 17f50352a3595725f133eda584aade076bd845f540f56032eddcc4e7118c914f
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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