Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e18935493dab569…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 13:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd75ce356c48c34ed8a1842245521574 SHA-1: daaf75e7967fbe2c71f61d0b64db8b1f10aa7ea4 SHA-256: 2e18935493dab56985082d588f76d5691188aa091de75a8724e44f580f100a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content or further stages of an attack. The presence of multiple links on disposable hosting and compromised WordPress sites reinforces its role in a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1524ce7c44a77f3151d500ed083d7d47/farejezujozivizo.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/kagapulutusagidasetu.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5i6gjb0voaotinqa3shl8bdvq2/vujimorabawesoxura.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/seulhc77b88ncm6v62fv3aamh8/nuzevegumimesuvewigi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7ad7919c079cd803b44ab222d1273753/87531856202.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92b6c3161---50117214750.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b583171834d---timipoxegafegejitibobine.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a610c5bb518d8b6f13ec3623830c460f/7844870436.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2c2fc1c290e4688e94f4971c780cefb3/52202990806.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/nudubodofagemizutefutom.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16127fafcc38c1---sasozetofeverokenujex.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/9458302879.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c59d6a874---vebakenasigupuwonovunexi.pdfIn PDF document text
    • https://datajournonepal.org/files/91203859406.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ea6d8949---vujafotoxazipekowasirune.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/vusewopowufanesasude.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/45557158519.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ec8f034a6657d2ed77c316535835e704/zedadirapenugeloso.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/55433ddfdccd32d2a1cd06cf81235683/vubese.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119263ce1a2f---nujewagavikulegeza.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/jubewodudapumekag.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/jalolowebakelumuwex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=handbook+food+processing+equipment+pdfPDF 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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 16440 bytes
SHA-256: a3624dd067ad191d6ce628834d705ae1ec985cd9625c7bf4e1c904feb910a444
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 11384 bytes
SHA-256: 0c3e8cd09b94dcf97dfd666d054df9b34b5b17bc9e8053f84f8bf39afc2bd4b2

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