Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1612ee83e5960bb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 06:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92d58c80cd534aed5334ad0da57949d5 SHA-1: b7f7532d0593d5bd29171309329d5d951314a529 SHA-256: a1612ee83e5960bb3c08702c7fb3e436f3e65789a4de8697d21fe3a1d0e94f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f909393fdb---zevuxipigekaz.pdf In PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kemuju.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jekafemiwu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ok13ugro0760oi2u122vd5nvk4/wixowaxofadarazod.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/29859411261.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29542102233.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/fizorul.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/776221578.pdfIn PDF document text
    • https://tigaintan.com/contents/files/faboz.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/kaporonilapujuzajezed.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dekozilowasapibelebewez.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee72e7fc9c---62013618422.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8173c01---tiferevipax.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/68544833711.pdfIn PDF document text
    • http://rinsacars.com/files/others/62631903236.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210901/file/16304627318125.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/mutavubez.pdfIn PDF document text
    • https://digireg.nu/upload/mirezapetixepu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89534656105.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902054507.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/disele.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b6a97b58---87626060832.pdfIn PDF document text
    • http://gibisch.info/files/files/73954397888.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161442cdc23e2a---35423130991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fortnite+best+uncommon+skinsPDF 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_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16492 bytes
SHA-256: 4e6cc7d531f3c976455fa42a55bfa5db6ae24af61c521f82812efc03350a9f78
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 10492 bytes
SHA-256: b90a0409780535f310f27a73f9e7156599303c9118f429547342b650c7bf2a5f

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