Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3886529379af1b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 06:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45bf8b9d1aaee1387f1d8d9c68d754a1 SHA-1: aed020009b42ba0665e7830d17eab73e25ef6eca SHA-256: 1a3886529379af1be0303efde64e28cd25264e44ef2784062a4dd55dbc8a35aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms on disposable hosting, often with UTM parameters suggesting SEO manipulation or traffic redirection. The presence of URLs like 'mobile+legends+diamond+hack+2021' suggests a lure for potentially fraudulent content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=mobile+legends+diamond+hack+2021 PDF link annotation
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/82642839689.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/10606319778.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rogigi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zekawifopidanowi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133dafe9326b---kezekonubekoru.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/jusokurosebunavidike.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210901150333.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556e45f525---garavewujedosotorede.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/ranuvopatulefikefago.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/kilulitogasa.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/mutovofuvutimapagevug.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/60101465342.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/kimesirizifofuzawime.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614279f45f00e---folurepijovawixemivuzexut.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134157f98e0b---3965792583.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/zebuxelejojezefa.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/kobujaweberuno.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/6672905390.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/wimumowikogewobowuvabiku.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/ruxisikiwosuwerimo.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/82630589818.pdfIn PDF document text
    • http://ruihuitax.com/files/file/62168450031.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/setelibavozerab.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/pegixikukifetox.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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 11140 bytes
SHA-256: 9d7d5379806f20e76b7dd76f3e9679df62951a398810de4b542b272168763aee
font_02_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16944 bytes
SHA-256: c27f80068556bef4949bd3804ce5c2ea406198cb47cc8274396e5e0b247a9efd

Open this report in the interactive analyzer, or submit your own file for analysis.