Malicious PDF — malware analysis report

Static analysis result for SHA-256 798bb0abd0cf5ec1…

MALICIOUS

PDF

81.3 KB Created: 2021-07-31 21:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcbd84e1cd2f12c8d171722f9c0df4a6 SHA-1: 847308b24087e8ade3fde2787f7e54e6132ab2ae SHA-256: 798bb0abd0cf5ec1803f39e3ca834738f8db660d05d38b376ae01fd3fb43988e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs implies an effort to redirect users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608123ed06a12---25215329744.pdf In PDF document text
    • https://alutat.com/data/file/siwopekutoxajozosoj.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/fosexulixuwawokuwevo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c75d12183---3577165975.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/potexu.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/4000518704.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/u43oq85j27ldgfb1f9j5im1ubr/xasipamimawofugobix.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9607bcfd418f5744448596382f4b5f2c/60021682301.pdfIn PDF document text
    • http://jaika.in/images/documents/files/3662690806.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5573iuqkfel73r98dt8ge4g9qu/38369366009.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/44957281231.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nutazudojozeku.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/74188423817.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b692da698---zaruvovorikelekuvis.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f00933209cf2bd90aa761cbef2905e67/34091040770.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/31284943711.pdfIn PDF document text
    • https://ebooksweb.net/files/file/91181628492.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1415a8d94---37122528596.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980a7405053---83058324894.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/59379729404.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c872e837861---83366418395.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/gulixesixa.pdfIn PDF document text
    • https://hirurgija.me//files/72248681940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=microsoft+windows+vista+ultimate+32+bit+iso+downloadPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11316 bytes
SHA-256: 226493782a073ad96281e058831e1c162a9bb673d1147569ff8d09cc056bc495
font_02_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16804 bytes
SHA-256: 8e9e069d24f7a0cfa668dd67fa52d90d7fdb44ce9f1b7654d3b8cdcaeac3c8a6