Malicious PDF — malware analysis report

Static analysis result for SHA-256 552dfbf08c63275b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 02:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 307d7d57e9fd2041c5e208ba4c5fa5ac SHA-1: 6464de28af19482b45083969909e0e23d3f03913 SHA-256: 552dfbf08c63275bd8cb0c219289277b582f9cc9c83431f1a17ab40fc06213cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. Several heuristics indicate a high likelihood of malicious intent, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, suggesting an attempt to obscure the true destination or leverage compromised websites. The ML classifier and ClamAV detection further support the malicious verdict. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://123podkrovie.sk/editor_uploads/files/sanipozemu.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78362877b---penukimeronuvuvep.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614161e81fb1e---dagowogunifu.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sevegof.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/39450754999.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/kovode.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lasisijivifutilaba.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/kipemuzuderoj.pdfIn PDF document text
    • https://attack.lt/images/files/16412009458.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/85786077463.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/91614513165.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/77028879995.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/33367217691.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/voxejesanijaxumoko.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/bagipamofuxumubuvowa.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kiwowinowet.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/lodugut.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/91126000730.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/zinagizafuf.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/doganojazid.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/duximisigaxomidamotuner.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c065f38c92fa080b535a6ed3927c7ff/vuxipoki.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210913062407.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95460963609.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/dijagofavefalazedurimabus.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/jorefib.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pegatedepujapivejavugizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+cloudsPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 17720 bytes
SHA-256: a1a4d159f45cc45d7d83ee45ef2bd96090193cc4985c8060dbd08c18fc2771d8
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 10212 bytes
SHA-256: e69a3c429c1299ef0657e7f7cb46d2700efa0a7e94c1aa42f7f7a2fe11d50109
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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