Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e298cb268da14f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c03833c338ca690b866ec4edce6cbebf SHA-1: 99f2fd44935afedcb1fb77f817f17781815f33e2 SHA-256: 87e298cb268da14fba86638229189a1ef9ea2a7faf5e90d3d013da0cf2b1d444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised or malicious websites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://chcial.ru/uplcv?utm_term=avengers+endgame+watch+online+hd PDF link annotation
    • http://andreuma.madteam.net/ckfinder/userfiles/files/xetuwejomobezaw.pdfIn PDF document text
    • http://caratow.be/userfiles/file/kidatifowaxurufot.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7resr1fe4051cpctmk08dev6/golipizun.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109041128382768.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/54747366451.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/munoriwuxewe.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091107041655.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/gopaxoduzebuvafa.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/remegobujarufowivuvipem.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/durawaxox.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/tikepuxesadiwol.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/mawiniruvube.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/48687368518.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/61242393394.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/10899110192.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/mogin.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/kakuwizotufikipufaguta.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/ritenokabekuvunakugunomur.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/vagamo.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/41508455543.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/95509393011.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/bc9be7e0b352a5b6174bc6e0c4138390/18561367923.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1b5b9c966---40724995111.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/33070089366.pdfIn PDF document text
    • 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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 15304 bytes
SHA-256: c3abca5699e1789fc61d1d3f91b5dc42f510ba1e8a320c6216c4525f6ec5129d
font_01_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 10948 bytes
SHA-256: 03dd7376984eb4863fa2e22154f3d221f114471bd12de078fc4dc509ebb17f15
font_02_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1