Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3818b1d83f36be…

MALICIOUS

PDF

73.2 KB Created: 2021-09-28 21:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef15ea92e92b3fa017037497431e86b5 SHA-1: a36f35a6d1b27f512ce6c8f4a1cc0709df62f2cd SHA-256: bc3818b1d83f36be06d6ffc5ffd174ae31fff7741cce724dafba3c6a4196a1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=fnaf+help+wanted+android+apk+download PDF link annotation
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/11037068984.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumelitufaxiwujik.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/93518461470.pdfIn PDF document text
    • http://vizcsap.hu/files/file/nalavolurizasabagugizuku.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa8caa7ff1---72764619865.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/liwotozubimamawifoboten.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4a39pajl579f9r57jpoo1djonk/60601334821.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/5302803490.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38388899915.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/072141219115.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/77320516144.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/68471810700.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/12177309758.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614e119ad7442---sulawigalilimokatipema.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/42215261854.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/98228627857.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/julipegezowudubapof.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/dafimemedevug.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/53779464212.pdfIn PDF document text
    • http://espokebar.com/uploads/files/pisikopazanopena.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614164628f524---32032244276.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fotinagukisusiwo.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/18908341022.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/natopuxaf.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/vabiru.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_off0000b702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB702 18308 bytes
SHA-256: cd9265a829fbf1956f6a7bb6eeb2eaa47bbb9f30a5cbe550004af0781b662ce8
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 10580 bytes
SHA-256: 57d7f4347b7b18a6ccc8e4b7d22362a632562cfabdd2b0366599fddec00774d7
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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