Malicious PDF — malware analysis report

Static analysis result for SHA-256 3557c0ba6522d668…

MALICIOUS

PDF

127.0 KB Created: 2021-07-13 18:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd752e1bcd6141866b7f728105ac6d07 SHA-1: 8491e8876c280676427ee3fe2c5257ffc910a7bb SHA-256: 3557c0ba6522d668e1ee30a52b860c3a5f121ac141b16167b2891878ab416b75
196 Risk Score

Malware Insights

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

The PDF contains a 'clipboard command execution lure', instructing the user to paste content into a shell, which is a common technique for executing malicious commands. Several URLs point to potentially compromised WordPress sites hosting PDF files, suggesting a link farm used for distributing malware. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c169a1d4---gapizumut.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pr98nps79envqr826r3mbne5l7/vuzifezinolasotomusodebeb.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5430161634.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe92f3480c---padopopufaguvuleludos.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/jetar.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ed90d1b8fa7290c648d0680dfa7aa9cb/zadixiz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/refosulazujeborazafom.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9e9fb67b1ffda666726be9696956dbb4/jemaxilifiwukaxatedibux.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sogikagasutejuzi.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/rubeji.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/91123078478.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhcld4n1s195kh6omaj6heplb3/72767559856.pdfIn PDF document text
    • http://cga82.com/admin/File/97561120273.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/pipuregifarolapasokamagu.pdfIn PDF document text
    • http://adveotec.com/img/file/zirogovetemuwetarizoze.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/55091955654.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aee56ff08---31828671311.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f5aada71ceb759b3d406eafe913217b7/mowujaxagusixosubogarixin.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2618715190.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc9db4eb5---zidiru.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3c90f357---totusurebodu.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0fa756c4---77102654982.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/91314927200.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/faxuzanemavupumafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+dna+polymerasePDF 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_off0001849a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1849A 21736 bytes
SHA-256: 621f855d0fba8dc76d1a97c6d1d730c1d6c93cd3216ec5a2d5b3edc2f831a83f
font_01_sfnt_off0001be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE9E 10544 bytes
SHA-256: 9435aadfa5b61837ed53c51fb107766105c2638682d40ad9f353141ac7f1eb76
font_02_sfnt_off0001d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1