Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b3e075b2193b0…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 17:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 984dad7529795a4e6c1940136a201939 SHA-1: bda234f9d97fb3e6383a49f37d3333761eaab991 SHA-256: 244b3e075b2193b04f4e5794c48b975ad544be01d5169120d3ba9a2608daf4a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=lightweight+android+emulator PDF link annotation
    • http://restavratorstvo.com/ckfinder/userfiles/files/mifupuvegekiz.pdfIn PDF document text
    • https://upaspor.com/resimler/files/wotidero.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/93144429172.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3222713---ladubar.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/jaxumiw.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/kagulubejevexugebetubon.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/mojevawenag.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/87994722811.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/nerasexemogu.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/sipob.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vezofik.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/numonelegubozumepafasixit.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66909818294.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1083820c88a1d2f0d68ca237195d8ef5/vikesepadikojopali.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa669b7128---10945939880.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/riwog.pdfIn PDF document text
    • https://sainaudit.mn/File/30497256998.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/83241716846.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/nupuwamojifibobu.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/gevimeduzujoxukami.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/96405276669.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/10018361237.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/62305752753.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/89862231411.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/gigonavonajupam.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca198e3570---61900329890.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d6433c4550cd80292f60c94127a6867e/wasiwatal.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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 17240 bytes
SHA-256: f9a9b7522eb8bda99d8e3a18814956b338244d6ab752a91b729a7bd4f3cb5edb
font_02_sfnt_off00012f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F93 10668 bytes
SHA-256: 1aa4a292296ed6868953beb770e080f27a3772d6ea4efa5686513e6e0e4e397e

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