Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5a8a23d47179a7…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 00:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c4fc8dd5ca2bd8ab2f4b151f053066c SHA-1: 904af984406afb9ad5b2644b4673cf2afba2fd50 SHA-256: 1e5a8a23d47179a7e9e9726d35c9cf4ca8cdfd1a856034aa3ddc3510337328ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users to malicious sites. The presence of external URIs and link farms on compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=tuberculosis+guidelines+2017+pdf PDF link annotation
    • http://csim.jp/ckeditor/uploads/files/netudipujozorazibofu.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/ganefavetomubimidafot.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/46b2ecc8b0a3492898f3df2402985dd3/61723444083.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/73738109973.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede4dc6160e---wazekegosovuri.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • https://songhongresort.com/img/files/bikivovutaxebasutanulobo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe04184e64---52500438939.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a68357f0a93---duvafubedar.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/91712252337.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4hiej84u90pfmk1l6s01mfe5t7/59164046652.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4802fd1dca3117400383fb1edb0620d9/vimevulomatoz.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/mewilakolas.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b769cef9---sagovowas.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fafuf.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/m37ibfo3f19npjkgdl4pbov425/18175298156.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/94009992594.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/52670681002.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/baece3b4a556cb4609c4e692951b888b/budoxeduf.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9969ef5a---lezekemesitiw.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/savumadezapakadelupuzas.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smlenphmlr9imh8cnda4hlluko/zufagelapipof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e58ab7212---pasap.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/nojaxo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3ikgvqfuq5pvql1q95e1cvgm46/96729450624.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_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 11080 bytes
SHA-256: a9fcc96e3fb66599e21007389bb1fdc1a31c3663dff51e5ce8dcdd0660d2e4c0
font_02_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 18080 bytes
SHA-256: d2a222ec21ecea05c4f60d033f7d2b69452d2eaf443ab334894f053b01587ebd

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