Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b3ad8d9ee25ebe…

MALICIOUS

PDF

84.8 KB Created: 2021-07-14 04:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2023214ce434916d07475affd360ba76 SHA-1: d727008aa4e33b180ae8057effe04a14b8ced205 SHA-256: 16b3ad8d9ee25ebeaa0bddc04b08455beeb9e73d0a1eb30aeb5a3e7999c18387
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dichvutheapec.com/upload/FCK/file/vabonuxafovexenarumavu.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-28/20210528115813804974.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/61362686140.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/22172002778.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/78c24be8a6f1dc55ce9bd046b123d28d/zizijetebefavob.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/tivofagumotemojotam.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fadivum.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/586464171.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/74a111d2f7cc3ec213fb0966887fb038/68049046440.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/bitajobas.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/nazito.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e1b1e85e1b7a8c269a1664c4bf13e42a/87305542350.pdfIn PDF document text
    • https://cecprint.com/images/file/58355670151.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b3d5f063a30e2fc7a1e8be75f50f7a07/2580379003.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/73880006882.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0937f80470---51730181335.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6449eef81dd2d33c6fca76f48de301b7/32151948826.pdfIn PDF document text
    • https://blugarden.eu/file/fawonilozobajali.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/jowizeb.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9c1978265de0decc1ceaed33f1872b5f/70268931518.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b477fc1de2817afc87ab85eb8a06f5b2/1953581082.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb54b2d52---81062286721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=rrb+group+d+general+science+pdf+in+bengaliPDF 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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 10984 bytes
SHA-256: 9417d9198685edae52b24f1499a6d028852c29d284fd8410b4e3a550cafedbc5
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16668 bytes
SHA-256: 2ae3da557ef10def7681173b7e5e74892f7146bf5e3b9fa9bfee9a494b32f481
font_02_sfnt_off00012c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.