Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b31c7244d4dba2d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 16:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a68832aeb6b9918c7eee603eb3ca92f SHA-1: 0b4886f26268fa770bee526b742fd7b3a9e909b7 SHA-256: 1b31c7244d4dba2df91c351d3fab37c454a59bff6f8e9a86a2580336e0c53999
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites and disposable hosting, suggesting a phishing or scam lure. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://msamericapageant.com/clients/873634/File/jorubetewa.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675cb31ae5---xafefug.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/77148745630.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18587b2be---91575812771.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/mizozape.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lafefifame.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/rexinirimiva.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/38433284856.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ek1ga1dailtgnugcq3hvtfg06a/7189238943.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/zazepofolo.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/43622725382.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2086b9fc1d2adecd218cff6b2ec76add/90677212798.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/padukufosew.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/popefuwubegenemaxivo.pdfIn PDF document text
    • http://short-story.ru/upload/file/1513468690.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mopaninugokuvolixij.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/93895189456.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4t3qqenidbg4pvhtchq0msrpm1/60944053836.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tekometeliralum.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/13524744797.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/towujasuxeferog.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f8399af5---velusi.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/zogox.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/zizozexeze.pdfIn PDF document text
    • https://nicosiacaffe.it/file/61591239158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=guia+medico+unimed+vitoria+2016+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC005 11232 bytes
SHA-256: f3fbf904fda777a0462b3533549dad38811e1935a3c408a8169ed448d90cc29c
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 18264 bytes
SHA-256: 72842fd8343c44b487d865754a8fe45a31e00a38552119e1bc492ef2cf251b30

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