Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a62d22ae2cc3694…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 23:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f50b7f8090e3bddf85c0626e8d27f890 SHA-1: 5d0446b11acfdde9fd89ce0b61035cc893706db5 SHA-256: 4a62d22ae2cc3694a439bc8b358ffad4ba00da331258c23310f4059489f2879f
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 an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the primary purpose is to redirect users to potentially malicious websites. The document body was unreadable, but the presence of many external URIs and compromised CMS upload links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=cinema+apk+file PDF link annotation
    • https://oykufestivali.com/ckfinder/userfiles/files/vororajarabisoso.pdfIn PDF document text
    • http://airfa.it/userfiles/file/5819556180.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jewogadededetowabezibujoj.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/ratitajafos.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/wukigorokolumagof.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b12d6d5a7---weduzopivegibukudezupo.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/65591540127.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/71960277984.pdfIn PDF document text
    • http://cripper.de/media/nujofamo.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/zupodosoxa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161394d35458bd---47679851324.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/kapodagivifuw.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/xegomaposuworakinab.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/13728025915.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/blqllas3lgma3l69vmnmvm9gst/80387082122.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1918023705.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/42f7c354c74fe6eee2eba06b20b64114/waserexevifelagaxazu.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rifaj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0253ef3ef225a83fd06409e1d6e9dfa2/kiwajenefodajodonuwonu.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/padisobasasodeji.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/4913575516.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/74085426395.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/59407929823.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/39582048161.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae975e5051---59252006734.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_off0000b07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 14524 bytes
SHA-256: 6f668f9973f2d65bff4d919e929a7686169d9c6d60157a5002b01c806f92e825
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 10156 bytes
SHA-256: 826bc7eb473ddb1faec84fe9a529a26474f22dcd2b60876fd35798650d67e75e
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1