Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f93ad77955c9c0…

MALICIOUS

PDF

80.1 KB Created: 2021-08-21 03:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0024a311197bfb3519a158a0442ba829 SHA-1: 2e8e0f4188400138e1cb098f901fb44975a7259a SHA-256: 49f93ad77955c9c0b069f2f3b7dcdfa3e8545cea25839bd9fa56db15fac1615c
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly imply an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://afghansolar.com/userfiles/file/jivarelalisuziginuk.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/47899552121.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rcicld61g6qg1uj5ac0gemp1o5/javafajafuvo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c94eb4e625e---99761118149.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb8e84ed2---56763010076.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a01f3f04bc9b8119d7a4268e2228d8fb/43428132766.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bdd5dc1f2e1ee5633f2609556a5b54af/85311885940.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d895fb2230---tuwetuwafovitepepasup.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/41036120191.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3498d7186---pugesotamavirupilig.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/68207779081.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/mamepojazas.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29141304695.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787dc8219e9---67762467038.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210820_749F26298422042D.pdfIn PDF document text
    • https://soechi.net/userfiles/file/naratadusezulerelebiri.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/15770677785.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/069i6vk9ebh4dbfppbpnvhkb84/nimun.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/451b1cc22faee3d32523d2ff4a20ec0d/474259348.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160959ce5cd6e5---74832217056.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8221e3e56---71485835380.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/63829164846.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7f15278b4756ba385836f2f08a5cfaca/55889949112.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/7877367728.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9140db43d---sesixokumalexikizor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minna+no+nihongo+jlpt+n5+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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10636 bytes
SHA-256: a9f5e68bf8c81bf9f8f18a606032c70bc969505eb31060bd735c57174d49388a
font_02_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 17896 bytes
SHA-256: f55c8165becb72d6669d5a2545eb0199e57fc33474dcc65396c85bf2cd79f2f7

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