Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18d9adaadc40948…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 17:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db4fb2952f97a61eb53e8f99f23d3c09 SHA-1: 7a264ec0d904ae9da623d87466bc973d79c758e4 SHA-256: a18d9adaadc40948dd702163896bcdd86e48ef5bb713e0f461b62f43a1a4f1d6
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=best+offline+tower+defense PDF link annotation
    • http://federicozucchettiarchitetto.eu/userfiles/files/8519649584.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/69541130187.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109122100368923.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/noraro.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/xatem.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/67579019032.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/suriruvipamojozixo.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/zupotulufilezaro.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613072feb6999---84273719735.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/67978820743.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/duziporos.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zaxebiduzekek.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/xufugus.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/87771058765.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/nebaduwidexefesazu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/wasopegewotaruvovupomej.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/34127633953.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/22368407319.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfa1dbf2d---vitawovinilizevexaj.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904040115.pdfIn PDF document text
    • http://519pf.com/userfiles/files/depaxabubufokovonujewif.pdfIn PDF document text
    • http://konberdbio.com/upload/files/mufilolotamekemerededize.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/92961979558.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/nimodus.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9692a591b---23042888074.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/wusexuxomedifal.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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 10324 bytes
SHA-256: bd385bf00235f1f7bb97950dee2b91d9427f70aeb52a034f19a0255948de5d83
font_02_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 18140 bytes
SHA-256: 60ea8a4558c9cc4dcfe9ab7b7bdb66cbd4869e8833f12268e3cc436898b974b2

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