Malicious PDF — malware analysis report

Static analysis result for SHA-256 356b485509659b67…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 06:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e33550af0e5b76410f18b084e81d765f SHA-1: 66d84a99b234e0ae684cab40550dfaaa185a44de SHA-256: 356b485509659b671c6b9faf4ff60b0edd2bcf36d353ae87db5950b94c907c90
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://muabannhagiare.net/images/uploads/files/tepik.pdf In PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/xonupuzamipux.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca147bf9b0---58395369400.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/89927993600.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608971d6aca5f---89158598346.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/27886776049.pdfIn PDF document text
    • http://paidionresearch.com/userfiles/files/15711273692.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/pilubobuwikibu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rgru5gt6iek8sr54797ijenom0/jazuzopasatonilenom.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/zesatezibe.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/94446570552.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec4c087e3b---gakovawoko.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/98921647095.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/41432596526.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072a22247b83---nemenajavexebezulipaluz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29f8afb79---88986929734.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236b6ef3ffd---60617888494.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a922af685---fopewopexi.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kagamutijegibokibowikirud.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/75986623551.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37832634578.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210808144354.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zirogobukuke.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jidezedegalekizev.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/batiwoki.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d150190c68---94650277316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=contrat+de+partenariat+public+priv%C3%A9+au+cameroun+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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 19032 bytes
SHA-256: a5324951e0caa685108035a65a661f972f603622dbfc3c9cf7734bda0284d9c5
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 11104 bytes
SHA-256: 792bddbad5d5aa1b9be9d0211328f75df987b5fe1907e843df3b5c8ada78ac7a

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