Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44e0a769243f24f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 00:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bdb39b29773537629e524074b75192da SHA-1: dc99449f435949d6ecee6ad9aad61b7c6e79b759 SHA-256: b44e0a769243f24f2b421f9db428e76a5c5f7597091f53a816d223f729c6336c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and link farms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f98af555b9---32015535047.pdf In PDF document text
    • http://hsaltsj.com/uploads/files/61463163573.pdfIn PDF document text
    • https://uangraja.com/contents/files/25039373238.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/18928383815.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161491d72d7a4a---69357975403.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/58486984950.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/93ca6dd52a0b7a3878713e9e30174850/guxidetomikogomapoj.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/41912461139.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/misugivegazejekub.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137954995221---lapezametix.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/vafipuposa.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vesazubesegisalanizuk.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/38883816308.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/dutimujuvevibadeda.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/13791821428.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/kizuzikofu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lijenawaselonokujedado.pdfIn PDF document text
    • http://minerva-collection.net/files/files/ginaminisimefofij.pdfIn PDF document text
    • https://funke.be/data/file/79264662228.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/80718008001.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ee1d3a5673701ec3deb4244ac18e6133/kemovejufuzetuvevejoza.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/11176875922.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/95735554402.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89059133309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sharingan+themes+for+android+free+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_off0000b619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB619 10964 bytes
SHA-256: 9264b47dcc37467a3c39acfff2528eec20e1979b1aeccea98724051cba621737
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16956 bytes
SHA-256: b663e011344c85684a5de499b3163797c362631df6154bd99d608ae80ab72788

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