Malicious PDF — malware analysis report

Static analysis result for SHA-256 2555e41ea3438f56…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 13:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7669bbe803fbfbc58683dc237db62395 SHA-1: 7358b5eabf18a6e060676ea064e81e0e9e03f0d8 SHA-256: 2555e41ea3438f565b8a90a96dcfd28a5d7c5a79790b92476e88d0276913f3f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external content, likely for phishing or malware distribution, though no specific payload or script was directly executed from this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dominant.name/userfiles/file/dugag.pdf In PDF document text
    • http://modaxch.com/userfiles/files/70203931397.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/96100532361.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/petuxadivosedotujoxetetup.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c0b18e0ce1552b20b25c312bf916102f/4380333169.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/16159182688.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/49363976023.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/130c06af3634932ddbe4193f71dc7418/bijokajix.pdfIn PDF document text
    • https://adikmanis.com/contents/files/56673096620.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16151465fcbb0e---vewufopodosarolisopunu.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/56888623633.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/63222258941.pdfIn PDF document text
    • http://xn--80aer5aza.xn--80aai5amepo3c7b7a.xn--p1ai/ckfinder/userfiles/files/86972206374.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/54020603543.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/28919203699.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/zatozobuwawizok.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/35739976016.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615062784ff54---8219864704.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/jodozananumamevu.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/26090573085.pdfIn PDF document text
    • http://renknh.com/ckupload/files/99939841444.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/49143279791.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/durixudumizugugaziki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=parts+of+tummyPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/namiromon.pdfIn PDF document text
    • 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 10216 bytes
SHA-256: f8dceafae2cf4e7018e356288735c84a56384fccbdd9b33cdc92e922cffa8af9
font_02_sfnt_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 17544 bytes
SHA-256: 2ef5dd4e9931ce0ee53009693ee828d211b1bde8a4a7af24bc330f16d096af06