Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a22dd587a180cd…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 15:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 357b628cb621c04a0d758e20334c38f9 SHA-1: a2415182c17bc3fc37ecf8d933ba8334cf8ad356 SHA-256: 04a22dd587a180cdfc3f926759b47f1843929c97496ef77caa2f736ec12f06a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ketchas.ru/uplcv?utm_term=intersection+of+two+sets+calculator PDF link annotation
    • http://newo.ru/files/files/90781549470.pdfIn PDF document text
    • http://holztreppe.pl/userfiles/file/98852547915.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c71e7405aa275642a4005abca5628cb8/90632190100.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/rozoriki.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161411eadd9c5f---zogolewudorakik.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/59480749864.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed58b68e92---jurafejubidaw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149570463320---jijibusubobuvulidutegij.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/fubavogujitawuf.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/gupedo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161355b7e55352---9227996017.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/goxudofilomake.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/2155878810.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kefalazibamabi.pdfIn PDF document text
    • http://vuason.vn/upload/files/juvopufuzotixi.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/batup.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/fiwukomovaz.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/bifazojaxakoj.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983e70c9e3---vokafokixafevorugivoku.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/mejikevinemego.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/95888806161.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/mafewusomavetixebo.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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 10468 bytes
SHA-256: 34a1cccc0be26012a92095127a2dd2cb4a4ffe90d4675dbe18d3ff69e70971f5
font_01_sfnt_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 14844 bytes
SHA-256: adb8ffb6b4fd27cc2a263bd615a9164c8be77e33e7e9a22c11bb28af3447f50c
font_02_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1