Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99c18afd0385d3b…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 01:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a41b9904675b16a21b8c5f60dfa7b3d SHA-1: f5fa798b832b22210485f6f92cde5612a4c03c9e SHA-256: e99c18afd0385d3b1979ab21a76822756af2cb165748ccc07421debcb17fbde6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload storage or other disposable hosting sites, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'hack gmail online' in the query parameters strongly indicates a phishing or social engineering attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristics, combined with ClamAV detection as a phishing trojan, support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://bibrka-school.org.ua/ckfinder/userfiles/files/90610970694.pdf In PDF document text
    • http://sayarbobinaj.com/file/21950994946.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/13690462553.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52625542545.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/geponukefof.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/muwisojimilasa.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/lixuratujexurazumebujabe.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/siregokesij.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/5332275412.pdfIn PDF document text
    • http://nprofit.hk/userfiles/99445311470.pdfIn PDF document text
    • http://gerocuki.hu/user/file/nujepipafinijajifebivi.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37582424490.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5eff26fdc47a867bcc9b06e5b3e9a915/xipifofuz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/78461365921.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/lixotupabumatuvu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bugefi.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/81050476566.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38412968507.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/20365065866.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/18045124494.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a66fe587afcaae5fc09351007021f168/dikabuligolav.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xufamilidal.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/bibugapoduwajadenu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/750f586203ef33d656ca9b4eed8010dd/bakapaxivewamibonutuj.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73f57f1f---19827164075.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/40170360780.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/lanoxedivedokixiwog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+gmail+onlinePDF 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_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 19176 bytes
SHA-256: cc07c20fa7bdb7dd16a702ac9f813eb39a532b3b4aba48ab243955c47703312a
font_01_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 10288 bytes
SHA-256: 5225af29b69ea7f7963c1e41b4df0bbb9e7287b2e3d82561891e9b815696fba1
font_02_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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