Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b25d4f39b67bc4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 11:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2a6a1bf05d79dcce9c209bd673400ce SHA-1: ed8ae9b372995a415124a38bd822bff72f1b2782 SHA-256: d5b25d4f39b67bc4754ae9e4306c0f17c5a2db71d292182dbfc0befbfa6703df
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The ML classifier strongly indicates maliciousness, and the presence of external URIs and a 'download button' heuristic further supports the conclusion that this document is intended to trick users into downloading malware. No scripts were extracted from this sample, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 https://oniceh.ru/uplcv?utm_term=sony+android+tv+browser PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8aef2cf3---76784428157.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jejojadikefisipe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb5bdc26c---siwilevediwexuzusug.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134a00540452---69794519640.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/28465464386.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/61248925543.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50831223268.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/68148625485.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904210404387620.pdfIn PDF document text
    • https://pindimana.in/uploads/file/52827476714.pdfIn PDF document text
    • https://akemi.ro/hirek/file/35515075139.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/wixul.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/93504906085.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/sazibokirovu.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sejex.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/92415083399.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161320cc7b0a13---zamufiwixaredenuluna.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/48008659622.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zavopovaxosevabigum.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161396937bf830---60527479493.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xasizawininepizixase.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/73329879189.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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 16796 bytes
SHA-256: bd6cd4dbec8d246b5d29be400b4bfed262cba152a485af83df3164246e473ae3
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10676 bytes
SHA-256: 4144cfbd515dcb118420e601d964c4fd81c10ba3e8a97f3e774c1be66809dfbe

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