Malicious PDF — malware analysis report

Static analysis result for SHA-256 5299caa958f5a809…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 12:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 889e0c7ff06f33bdad37a98bab595628 SHA-1: 68315f2543ff2ef8471e7bff20e9f434de9d5e89 SHA-256: 5299caa958f5a8091334d740d7738059b099c9b61b1b69f58ebd134909e6cc3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and links to compromised WordPress upload storage, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=juegos+para+emulador+playstation+2+android PDF link annotation
    • http://szymonadamczyk.pl/uploads/fck/file/kelewelokubimeropibukidos.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/dorilijulapoligivofisotor.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/letezamibegemizob.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613593e2dcce0---52705673611.pdfIn PDF document text
    • https://ka-base.no/images_students/files/jixebojutegu.pdfIn PDF document text
    • http://cityfate.com/files/files/27848744614.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/soluworubumu.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/76140118241.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/fusujadepora.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631531348.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/22855022476.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/midesefezemusanaxibuxilad.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/pumorijirideni.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/89012228982.pdfIn PDF document text
    • http://iucecb.com/files/file/32069482151.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/77003485387.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f79b20c28---95078676834.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kagubarezexekoni.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/64601231537.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tenovisukomozino.pdfIn PDF document text
    • https://foulardfotografando.it/file/31331728899.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/silosisugot.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210908030457_1024701757.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ba02fe93abc7d4b6db016dedeb344f3f/81181966698.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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 11060 bytes
SHA-256: b7d3e2a7c298d9ae3b29931ffa3a311feafc0f2d72eee3e5f735c209867f7f09
font_01_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 17372 bytes
SHA-256: e9487b06ed2959a74439990e8be797ab08e6c52fe47da573bdf9debe76c1bff2
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1