Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f596e338d12f8be…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 15:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 550ed09f5b39b65b066c06c23d6c3a8c SHA-1: 6cafa9d5cc3a1f2f251674f085193ca0a94fac5f SHA-256: 1f596e338d12f8beef6a97c3174840fc004f8622522046dd31d9f079b64dd804
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, several of which are flagged as potentially compromised or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of multiple links on potentially untrusted domains suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://t-p-fortune.com/userfiles/file/gosaso.pdf In PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/88077627185.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/92841909226.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/81870360899.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/67906855882.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/37949286226.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/figixunujefixuvep.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/lukanobirami.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/xarokisisinidis.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vojegipapu.pdfIn PDF document text
    • http://iccarrentals.com/files/file/dukibarusukolekezaweja.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31f6d16c---22811150053.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/30afc3c33ebcc20043958ed3961325cb/sisalewawevixozamugise.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce20219200---gesivoraluno.pdfIn PDF document text
    • http://zamgph.com/uploads/file/072243042858.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nijurerozirexe.pdfIn PDF document text
    • http://keyday.ru/files/files/lejunevowujidivivumij.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/jedimib.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210913_220228.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d44518e7---93570567186.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8654dde7---supemorakibo.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/tugufojajeranusi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38453361516.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/31350966034.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/xagogefabamuxutut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+vpn+address+on+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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 17164 bytes
SHA-256: facc9ea2dc7475eba95c985414462557da03201d52f3ecdb7abde3256216c0b9
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10892 bytes
SHA-256: 384f72e6a68c536c641e7e6ec6c5f3e06701f910739bcba6ea8e214b873b0552

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