Malicious PDF — malware analysis report

Static analysis result for SHA-256 890cd009fbfbb2f4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 10:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c43d5d1c42b043c77232186a2d2195ce SHA-1: cf88cfbba138a635eba9210de94c996094529857 SHA-256: 890cd009fbfbb2f4d51dec3d6b6c8af87689b47813027402c5f4f8d82c7f1060
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress upload directories. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of hosting malicious files on compromised sites. The embedded JavaScript, while not directly executable in this context, suggests a potential for malicious scripting if the PDF were to be rendered in an environment that supports it. The primary function appears to be distributing further malicious content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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 http://sk4education.com/ckfinder/userfiles/files/pupabab.pdf In PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/wuwiwujixepelejetamijosor.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/80506243333.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/sasobimiw.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7406682405.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4e7bd211---lefotatikawurufurinolotap.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/gajabavub.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/67645321490.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/worikexoto.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210917_01B0C8F151C4E8DF.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/safabutelovezigo.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/totonanewudafikekivizumiz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b7989e37---30709822537.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lafitexitumare.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/93792657378.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/43170411056.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/zotigobasizopeket.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bee81eca9---jutubipulofufuwuxedaman.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f471edff4---20777027794.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/ditedimakuloxamuvapifi.pdfIn PDF document text
    • https://scalper.ir/data/files/file/14635557525.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76505ae27---96634217943.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/30506183018.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/roduralekarep.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dexogulozedezurojixiza.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/77510870019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+log+out+on+messenger+androidPDF 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_off0000c16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16D 10768 bytes
SHA-256: 88a5203ac5e6c3045384c64960a0b6a38762a32c40d25274e78435035fb1d854
font_01_sfnt_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 17064 bytes
SHA-256: fc9b0e37a29cb9a5a4a64b4e3444d6aec69f20f9fd46f5174a0ade3cfa7b1251

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