Malicious PDF — malware analysis report

Static analysis result for SHA-256 44621ee8dd116aef…

MALICIOUS

PDF

90.1 KB Created: 2021-09-08 21:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c3fd1c192f21f940011402084bd26c1 SHA-1: 262942c103dbb5aea2dfc5ef431c10a1a5bfec45 SHA-256: 44621ee8dd116aef5d9c624ff602918168b7d05aea027f5728665e35614defec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pretext, where the user is prompted to call a number. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://toyotaquangninh.org/data/dulieu/files/3425945257.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131c594a07ac---vamekazorupoturuxiba.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/lazasiboranaseje.pdfIn PDF document text
    • https://forssh.com/userfiles/file/zetipodesizejuvenosive.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/vewanulewekeniwez.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/kules.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/81616257961.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/divarifu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/kasedikixitagi.pdfIn PDF document text
    • http://poiskvod.ru/images/file/petebirubupuwomelapadaja.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vutiz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e490cd3e---73426926986.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///pakinukak.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/seketa.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/limukikokafer.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xejigizotinawapekev.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/42505620249.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4e5eda1408ebb6fc9bd7e19c35d549c2/28745221479.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/kazaxi.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wilelobogevolalipopef.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/63049542518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ethiopian+english+teacher+guide+grade+9+pdfPDF 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_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 11152 bytes
SHA-256: f725e02b07f57ac59930b78d4e303aba994e8abc04efe346d2a259144dee1955
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 19256 bytes
SHA-256: eed8e2adf83b57d1aeaf382f39d70d438075b9cbb4e9729be7691abe7b7c410c

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