Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f230a100d5b8f85…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 18:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: caeab3a745a815e7483b215b5cfb2b91 SHA-1: 085e21a84f5d3e1d8af719fcbacb4886058fbc07 SHA-256: 3f230a100d5b8f85cee26f793fd648bca1406732306379368d360daf1e354c65
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chupwo.com/editor_upload/file/xizufulaju.pdf In PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/lewor.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/59907313337.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/vasebuvofesavubijadamow.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/werakokofufemodukasanot.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/99747983194.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ac60e59f---31480393268.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/95f4a2289bca0b90cce1c9d38c027092/likoxenubitexotene.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0dc9982c---luwosepatitakidopof.pdfIn PDF document text
    • http://www.infos-lentilles-de-contact.com/images-sites/files/medivaxalibivelu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa5431366---denumu.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/gurinilitewalapa.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/popuzarajapukujafaduve.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/pabukipepasamewudor.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/415b32b12a879ac98c77d0d9d50a1ebe/digubuwuvelo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/39593347756.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/81427547635.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3nq4sse5g8bpk0rpuicm8t841e/22494306029.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//juvala.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/vorulusevezexirilu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45d507bd3---xefuwujimozolupumubonukuw.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210729_210100.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/toson.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kcse+history+paper+2+2016+pdfPDF 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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 11136 bytes
SHA-256: 4e1b7ac8df781207a720266b3713e481ec040ac7d3f34f5d5a027ec8cc443200
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 17076 bytes
SHA-256: a3d9b160a9eaa7389a172ae51e0187d2c5d7081b764e5a5bd02d3f714e4d617e

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