Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef41c97dad3912…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 15:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e92ef27abd618a9f2f58ac4db3a0505a SHA-1: a01fa953c07d7c7d321305ab32cef94bad589a8d SHA-256: 88ef41c97dad391290e29976deb49190132fcb1fe6165692f3c8736e92119077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/67060717695.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/tavafi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cf6502b3---kovavizixodebi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/botiwamupogotelere.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/33829232325.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/42869484105.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/zijutataxufutulafokizaliz.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5jvo6irg33gjqvtrjunvl5r3gq/koluzejilarasinimisif.pdfIn PDF document text
    • http://servmed.net/userfiles/file/70784307509.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160855b8040778---24543179681.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beec6d3d4b---53787072477.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/jafuk.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74b8b49b---62843660693.pdfIn PDF document text
    • http://apvn.info/userfiles/file/nolejunejivazu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/46561367805.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/01/xobekikonunidulanewu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/robuxizuledizozoto.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/65982137749.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lolajolelizoxogovuxorijus.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/78219838945.pdfIn PDF document text
    • http://pk.mo/userfiles/file/zezupogijibivubabolu.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/1460851401.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/lj2aqe6tt71hcta1pet9r8ib0m/58297004098.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50571766645.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/wevof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sealed+air+instapak+901+manualPDF 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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 11040 bytes
SHA-256: 0a022724faaa9ea7d6709e1469660b0335cd08766acebea41544e60ebad58ee8
font_02_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 17724 bytes
SHA-256: d80a85940172d9bc8e3bb69e11dfb965497936106b92008c420319a77e578dfb

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