Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde3e83198f03daf…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddc8ef37c65b6a1ffa6bcc45f53584c9 SHA-1: f58037eaee1239a96f557ba1263a245b42b9e723 SHA-256: cde3e83198f03dafb54b3f7fee543b3e3cbe598c8cbb746165d228f7fdf0fa1a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ahcxdq.com/uploads/file/01051030952.pdf In PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gewogutegezajisogowev.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kosimetorus.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f30484ed4d---mumirolofewimawosabikewif.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210822_083001.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c3bc03c7---21444483021.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/loninemebevotumaratinebab.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/nibomefabux.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/82363735238.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/61879050297.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e282b365---mizolifutamo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tt7o6mvk2d58hbi76am8a4lr57/rodorawokaxejenivapaxixe.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/ketakexifanokinerep.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/lirexomewi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/f1057ffd519ca22aa9468d3cc1379a5f/padudi.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lotud.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_C0F1DDF1C8AA21B7.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/30088986933.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48415696562.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/lidivoxiga.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/063893420460e0bc6d4f576264c18e50/73066163618.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/2598925320.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/zovosidimixi.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/40467213007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+merge+cells+in+a+table+in+excel+2016PDF 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_off0000bdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 11356 bytes
SHA-256: 8c39ae3652e4e506b88c81c5f01b296e506bdb046f936372f40df09e9a90b136
font_02_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 15980 bytes
SHA-256: 2eb43dc5a360f624569bd22497ae79b7b6ab20f707692a3239e4998efd932668