Malicious PDF — malware analysis report

Static analysis result for SHA-256 4271b6c0808ca568…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1068d3b9a1eb8ff0eb3313f76f48f11b SHA-1: 85e9378ef1cac0216d661d5d4744e6412b9d0e45 SHA-256: 4271b6c0808ca5689bc6530a6045ee7ce5fb57c691bcc5617d75326d7687a6d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that lead to potentially compromised websites, including those using CMS upload storage. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://tainanrup.longi.tw/uploadfiles/files/20210902_075650_5357.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344caf63112---72110067934.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/87037739406.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/50555392695.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/koxosumorekozasexixu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/rilasigigusaposa.pdfIn PDF document text
    • https://tempegaring.com/contents/files/tinusenolozopile.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143be07a68a3---18574223135.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/botogebikojudisivu.pdfIn PDF document text
    • http://pasted-radio.de/web/files/29911352026.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kipimevofuxewigiv.pdfIn PDF document text
    • https://stormester.no/files/file/saloberufekajozafovejuka.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/12860396324.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/luwika.pdfIn PDF document text
    • http://www.og2c.com/images/file/vagojederosabit.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/relozanujulezaxananudib.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zenazeluxi.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/44206363672.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zaxuvajimif.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mujuwe.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136317453aec---47766948808.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/segunulewumewuxawaga.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137491a5a4d1---87406337963.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/nupaxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+puzzles+%26+spells+apkPDF 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_off0000c50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10316 bytes
SHA-256: 33e295262fe025b7fcbabea0e6a451300831146b40b03afe0c192d285ad9cc82
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 17572 bytes
SHA-256: 2959867ba5b7cc1263ad007828c8ea165a689dbb15d1a7b3c815acccbd4b2697

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