Malicious PDF — malware analysis report

Static analysis result for SHA-256 25248cb315411b31…

MALICIOUS

PDF

127.5 KB Created: 2021-08-19 09:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 643a7a44d1b30a58cd95e3e6bb790b11 SHA-1: f4bf95b38bbe04a8be30d2d975aa59c3bbd9168a SHA-256: 25248cb315411b314ad53e244bcba9fab8ce4dd49d4b33d2c3999c45c3daabbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to download content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dansobentre.net/uploads/file/kavoris.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/rodiwiriwejulasoj.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nivuruduxirepene.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/bexujodefibobut.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86c9b0f835---46689895413.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/61577618660.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c307f0d705f---rozujokoxa.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/45379530185.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kigetumesubodujosajuvel.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b885ebfb34---jimijovel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9b3b6a47---nodakipikizus.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ff7ad62d59930da8410e7af78c2e3f93/29772450783.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/448fbbcdb9cf17ef1d790c1d369b08f1/bakadusurikunowukoniti.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/cfdc4849a31b1753981e9b5cbdb763d3/nezuzut.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/92772733810.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/58708045030.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89832d80d---76802368894.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f96ae35c2---98273949293.pdfIn PDF document text
    • https://chp-travel.ir/data/file/45269452597.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/74903543379.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3541ef11---97972569035.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa71b0ff---xuzijimefuwikeriwa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609354ff12496---todunajimi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3162a70b15e712e336fdff069395bc31/6952858986.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/20f12586529c4333249cba9c9bf8e6e7/35757083113.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/907565985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=super+smash+bros+brawl+download+for+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BB 5428 bytes
SHA-256: b787a771c9db625558dd14aaa67ad6bc8e843ee7258138132da95361ca27e5fa
font_01_sfnt_off00018b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B55 18164 bytes
SHA-256: a5db0a4b1342129979a3b21684fb59c182cf925141c096ae3b7945407acac4fa
font_02_sfnt_off0001ba58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D26F 11064 bytes
SHA-256: 5089bb3d3e4c9fe59a306a2e8a2f81b4b97aed45284dd2138cb75929ed388713

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