Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a8e50d94a4dd76…

MALICIOUS

PDF

82.7 KB Created: 2021-10-09 04:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a14d9ff90315e42311e4d9657b2a95c3 SHA-1: 8bf359c56f45fb4089165cd2bcd86281f1411f13 SHA-256: 53a8e50d94a4dd76a18d2a7c068279c9bff77d243d2524c4a3c2a79c2652a12e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised or disposable domains, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=moving+charges+and+magnetism+class+12+formulas PDF link annotation
    • https://ever.dacola.com/upload/files/53099153694.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/fidabugibuludejanerupudo.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/kujavijisanelu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4c1ecdf0f17ab8134a2737e5bad4cc59/27246727878.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vixisiziwuwejuxemanaku.pdfIn PDF document text
    • https://hitelesen.com/userfiles/file/supipadibogupubigilowa.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/xuvokufidajiwawupeg.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/tekumuvinuwajedafumoge.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/nobakipinamejelebatu.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109052246525650.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1bf128fc6479f9f706dae4b22910419/sesokudomidowaxu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/vibejegediwekowikapizenev.pdfIn PDF document text
    • https://drlanda.hu/user/file/4251903515.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/surexuvinodexewilusunivul.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/rawazimiw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613528aa74760---febuwategalewifugurep.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/butekos.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kukoxosowireratejajarid.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/virujitik.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16134a547ef5af---xopofidajomakovugapal.pdfIn PDF document text
    • http://betriacum.madteam.net/ckfinder/userfiles/files/nopedopulonugozexulotiz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615e517dd8596---wijok.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/69074663379.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/28574238048.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/nokurigotabe.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 19048 bytes
SHA-256: 697362ff20279a285ae55797273f33fea6c2762357df0a6d1a1ccdce80db52d4
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 11256 bytes
SHA-256: 9704a64fd22c76fa0b6cc2f2a4f29d3a15052700932ec648a76ae7218d20a3a1

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