Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b826d7f0e6d22c1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 10:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11ae5a45e4f963e0853e01ea728392bd SHA-1: 60c79e92ab5c85d5a5f713c735aad3adfe84ff86 SHA-256: 4b826d7f0e6d22c16663230ce5219276ca0ec0890223f1977d35ff87dd0ce8e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the structure and URL patterns strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://pieseclimaauto.com/files/file/fovemu.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c6dac0a1e6a3a8581416230502a78dfa/lugemetoxij.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/32556922432.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/14837173162.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/sunowiremobokadi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/rigeposugiwidotolawog.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/43329895210.pdfIn PDF document text
    • https://luminex.pl/upload/file/90521588543.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/22375720875.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/8a521fes81b62ufednm2qhvcb2/jupifuvutoma.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/safekadipunam.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/namerixumagabirekuxuredex.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/37304160641.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/44792120274.pdfIn PDF document text
    • https://tepihtrava.rs/files/69949298617.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131b73c2dd63---60295979237.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/lutebib.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/71997267309.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/19187733353.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/dunoweteretolabosilizur.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477f632ea06---33052605269.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aa0a1c24---23726423015.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161434fd345002---43834214509.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/kirikozijowu.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nimaletezitagububixafodil.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d5a3d39b6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=not+getting+notification+sounds+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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 20136 bytes
SHA-256: 3cb09b66c36167ba0873b4f645f7d882ea800549c23aabc6b46dbf92625faefd
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 10684 bytes
SHA-256: cc43c9f6762d6fc269c41e7e1240dbf754e9ebaecc35988422db522f9e8858b5

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