Malicious PDF — malware analysis report

Static analysis result for SHA-256 c640e4aef6dfeffd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8146c060d35088a855181fbdcb03ec5 SHA-1: 40bf2b12ba4fad0c74b6b9e16ae78398b15b614c SHA-256: c640e4aef6dfeffd2760906f5ba5f262e8be961fcb463b61b77e3d99c02eff70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or potentially compromised hosting. The primary function appears to be directing users to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://hesexpo.com/img/editor/image/file/popoju.pdf In PDF document text
    • http://hoangnamjsc.com/upload/files/90578678885.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/zopilumamakugepefufomiveb.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xelurakukabaxa.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/90408143482.pdfIn PDF document text
    • https://agatanorek.com/files/file/12278071570.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/mulumitolad.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vijijilewuxemelananuz.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/15197259056.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a9fbef750---5269819636.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba428229e---pusogowonijorepipofujuro.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/wirilotopegemevolatil.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/1942fbe470956f66f018d295245f92d6/34466017028.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/tebenekomo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/gavuxufiv.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/30896466998.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609850d9b670c---lasobogeres.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/202d8dc7dc1db26c2ce3eecf26f98471/birizu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/676e1c45acab16ba92340689f784849c/vebatanaxelefaw.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/boxozib.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9puqepu6nmv9sp9cclih711on7/fapubegomulozadulijed.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/836f9021b78f61b038f43c4df41a8c06/72937274537.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/17543224635.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/70408167411.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a24d8c099---sazilipejujebexevutano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=3.3+earth%27s+spheres+worksheet+answer+keyPDF 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_off0000ba37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 10676 bytes
SHA-256: 77784239b871a2c7e2a31a79caa1df3fdc9887b4f09b2c207d785c482570957f
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 16124 bytes
SHA-256: d1a3490ec1e143c45fb63e49c85acff78954da6626b27a8ad64ca85fd20da741
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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