Malicious PDF — malware analysis report

Static analysis result for SHA-256 b272f9d4b4e01730…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c671a37dc11ee201d7251416f6c7be6 SHA-1: 664f66a3bb933ab45d35a92dd46b5c8b99a743a6 SHA-256: b272f9d4b4e017306fceb202b8d083163b857f408bd712c5dc292195af5ac10b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b646c7c827---94921783072.pdf In PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/sotubezolimab.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/59657202327.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nefuriku.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/divilevebujutunuma.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/lexabunokegasato.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911213814350939.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/xixolelefiv.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/lazumasiwogo.pdfIn PDF document text
    • http://apothepharma.com/upload/files/dejegilinorejejam.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/vemoxavogatufafilijozub.pdfIn PDF document text
    • http://bushurov.ru/images/files/xavomusolurekanagipezi.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/fusofefanod.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613380e3a0d6a---ribavimozeborodilugutoxed.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/85003319824.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2b607317---vufupefekixixopuru.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/40842388217.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210902221315.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/sesoralerizodu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/17333776365.pdfIn PDF document text
    • http://namngonviet.com/user-/files/difuwazeb.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/63137639914.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28644103319.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/89749791289.pdfIn PDF document text
    • https://insp.biz/img/file/ketopifava.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/21649642510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shrew+soft+vpn+client+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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 15336 bytes
SHA-256: ff2ed452a51dfecde5414fd3d09140623f694611d0f34fccd5db0c6e013b205f
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 10944 bytes
SHA-256: 0f92c533a8550611b76e00e63bdbf8abbf0f918f680c22b2f0fb0182cd8965df
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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