Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddf6cc5f67ea0f4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-24 17:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60ce6e1804f4323fc083be654b22cca8 SHA-1: a89f65ac6604397bf0ba64bf2ea7a36f0e9e618c SHA-256: 4ddf6cc5f67ea0f41b7cc2dcc9b59ac3051dd4063425ace808191d61cf0e6e51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 http://tostonet.cl/ckfinder/userfiles/files/rosedudepin.pdf In PDF document text
    • http://union-montage.pl/userfiles/file/77457072808.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/ditefilovevejodivowazuz.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/93500190897.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5d13d396---jomakizisu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdfIn PDF document text
    • https://electroagro.es/pub/files/1348415109.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fasanolaridofenetekofo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6c8766f94---30905757758.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/wezevufewadamajovijazaf.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/kifimonaniromun.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bepovetelifosufimevisen.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/96604838943.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/99103888199.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jejosafofemopamonoveni.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/gufoniwezivukeruvu.pdfIn PDF document text
    • https://vleek.com/uploads/files/36573976923.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/86760129005.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/30752182197.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32kh91abf906cr5nndcminvmu1/38845338733.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131569d4cb84---fevegesizugefametatom.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-19/images/files/wuworoburibokovovuxevos.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/45879103750.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nojuke.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/46uigd74clmmb5lakcij9u0os6/481918000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+restore+blocked+messages+on+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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 19368 bytes
SHA-256: a5f9bc91d4822894b238e5bb212a358aa8f898abb5912855834146128e8417ad
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 11020 bytes
SHA-256: 15680046b2ee86fea79eb040dd28989ea7c304e8a5542756955fb45a86fb91fb

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