Malicious PDF — malware analysis report

Static analysis result for SHA-256 c841ab6f60aa6752…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 08:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da08b8997686563c26ab64823dd10a67 SHA-1: ae1330545dfb4699f9b2334c6eaf9976f5164753 SHA-256: c841ab6f60aa6752bb69a8f9d7814e359657cd6dff86e2f0a27f8417faabe11b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to download further malicious content. The presence of algorithmically generated URLs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088b16b0e92e---fobasuwuvadojuzoveled.pdf In PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/60116120270.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/toxelinizutonuto.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6195b042d---wowetewem.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610fef33b2440---81929276868.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/forowadifavazo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984550e78b4---bozurimematugegoxuvutid.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/pogewabibijolezilafofaxa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b46e587f8fe6d4273748f19f5e3e4062/raxefebofijej.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/89715055899.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9ce238666---51551425994.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afd12f91c32---zenunidalawubuzu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/88610dca142e2b43cdd7750c617d7273/nimukurura.pdfIn PDF document text
    • http://balone.net/_upload/file///simodi.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/tawazabavutosatanefazuden.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fe0978289---safar.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9d0e5df989634774d9eb3037e1fca3da/9945857882.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/wamete.pdfIn PDF document text
    • https://mytopics.it/uploads/file/bowirofunawawibitotejo.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ed694144badda0caaf96a29a08551b4/16385697008.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/fitufeladurejomanogar.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/26952358308.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/kenufaner.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/38596379986.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xetomawibuvejinid.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/63dc4c18ef4d76c352dd4f79dff3d2ee/44998348667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=uninstall+exchange+server+2013+manuallyPDF 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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 11412 bytes
SHA-256: f87e9a656bbea9c2e4084f65db7e283b848bb4112d818f415c188b192d3a5035
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 18104 bytes
SHA-256: 1abe04424f45921e8ea38b12420f96b059a2cb67a1140011da8023b56c49c085

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