Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d0620a4e2e4dfb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 18:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6608660aeb2c725907375a2e469b2fc SHA-1: 6de02035ee4db2e9f2c26a5de25288cf9ed869a3 SHA-256: b1d0620a4e2e4dfb38b4a8a36185345b6bc7d64af96a351598f528191bbc14a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and potentially disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.phuketvillarentalandservices.com/ckfinder/userfiles/files/40935332272.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b66c9d176752d6fe01f2cb3be85aa666/xituditovijokolelamak.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021917912294149.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/39056921090.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38748cc3ecc6f9a6288cc2e28f2d827e/12235783541.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dbbdec8---36784010511.pdfIn PDF document text
    • https://soechi.id/userfiles/file/rifawiwunusezebodanizixu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/golon.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zoxugawufigasosizati.pdfIn PDF document text
    • http://hiniceshine.com/upload/2016721817.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/98918627720.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/89622461111.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/21431375042.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/bonemirojuruwejukez.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/jikupamavuz.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zomuvugak.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/79740502621.pdfIn PDF document text
    • https://casaalu.com/luutru/files/94182809381.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0a400946---sepilipadexa.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/jigovoxewipuso.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/bizeru.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kevexutezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=swahili+worship+songs+lyricsPDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 17720 bytes
SHA-256: 181bdba21cbab4a3d2b4f79df060180e9f80619f9ba86438348d460f7befe772
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10700 bytes
SHA-256: dcf74ba964b9203361a3f1a20edee31c12e76a12464d74293a679ed7d961fef8