Malicious PDF — malware analysis report

Static analysis result for SHA-256 710500071c5efdf3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 10:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6727646996145625850020b44f1208dc SHA-1: ba0961eabe9966fca3e10797b14cc876ebc24c08 SHA-256: 710500071c5efdf3db4103211fb8d5fa207ce14139e9cd5652fc70e33f926882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337b73bd62---85503643619.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5cb5230ea---36927694340.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/21753214192.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/50496942213.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sikilofafosonegisup.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-3/20210903231540471931.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/29001743393.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f3ad1d50---nejubobanise.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/28856175701.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1146b6fe---gixuginomawabu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0718e30eb1dea4d660ea51a573d5ea66/95947627450.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c3e0ba57982d0c00fdc8c04c9c1473f2/2584478698.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/setubitedisowe.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/penuzaxi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/numep.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a089c17f1---mupilukuguv.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/82219496573.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/55284542706.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/tifov.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxetipu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fce6762f---gejefaganetuxomavuwuvuge.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dcf67874d905f69d718225e1fe214505/gowebemetefemefadug.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210630_A3C04ABB7B085A6F.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/35963840196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=harga+suzuki+splash+2013+manualPDF 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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 16956 bytes
SHA-256: 0b089550f960fb0b3385cdb7697a6925bc650cef3f7b3b50a9b5c46e9640bdfe
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 11060 bytes
SHA-256: f39ece2506b47e3df0a8a27aa28f466e1d46b815507a71b4aa3575970599e9d1