Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33360528b3bc5d4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 00:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2c5eb6e75231fed548e026ce754e56b SHA-1: 6e42506b652951434ecde2fd01e77077eec94b95 SHA-256: d33360528b3bc5d4c8ecababe4a0718b0a96b674457424c9e60beabf884cf895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest the primary goal is to redirect users to external, potentially 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://crysiq.ru/uplcv?utm_term=honey+block+recipe PDF link annotation
    • http://jjc-dev.com/userfiles/file/32040020024.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/tazalen.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/piwoni.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///61521227106.pdfIn PDF document text
    • https://kermanrooz.com/img/files/sovozimuwejej.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/gatulujokuxuxipoza.pdfIn PDF document text
    • https://bak.vn/upload/files/dijefuxiwukud.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/sefaxexiwosabupoxugulodax.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c610df2176---temijokerofej.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/gajowaxuvadodumuwoveba.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fawojaditafexivutagewowug.pdfIn PDF document text
    • http://artdental.hu/editor_up/lamedegedivaxifudo.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/xadozolefejuruxu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0d9c3a2282cf526dad02e7442a415d04/50336793609.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/madipeliwavinazufidubepo.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/34194030577.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/25433613837.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/warepirewodatadik.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/77114420368.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ur8101ug4d3q7jn0mf687rueh6/sidodil.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/tinamaguguguxuxuxanetujap.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/55728870841.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/nejeretemafogalewen.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/12146309377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136481a30e01---65149046807.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_off0000b4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C1 10276 bytes
SHA-256: 7f5815778603597270aa1bacebb7aa6cc89f9cc4849e844f4037eb0b169cd5f6
font_01_sfnt_off0000cbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 17352 bytes
SHA-256: 26dabec2d89646ba64b6790d7c9b0a1489fbd8e02ec647e2a2453ed91f998c0f
font_02_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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