Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45ddfedf27ad9d3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 23:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72bf4d125f5b7791176b5f66b78724f4 SHA-1: 9518b8477c4e52ba9cbd5994c38aa4996c4e1c8e SHA-256: a45ddfedf27ad9d30f48a75a7b3aae579d633aef94a005294942f43c343050f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=little+stars+camera+apk PDF link annotation
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/dadunebawito.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/29982911500.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/98960073607.pdfIn PDF document text
    • https://orangerun.re/photo/files/99119672001.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wewizoxiloseveg.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/gabojavanirubigaga.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/vejorotox.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/61349942690.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/lineludil.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/barerizopujexenij.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/87424328885.pdfIn PDF document text
    • https://tsegypt.com/file/gidusilijivemusewonubef.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/93736618821.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/xonove.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/guvoduriwine.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/76870771231.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/054ba4436cec8edbf4efd9ec97398940/xaxagafaweripeliposewe.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xetakiparejixenoj.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/begafisinepebugol.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ed607efe3575b630f6e86b6a974a048f/xebaluzebasafumevupax.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/87774027847.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164eee4fb2---mararigodimiz.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_off0000b834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB834 18944 bytes
SHA-256: 4904eb8ad720411e8eebcf66e4487ea81e38ec7a621536eb68f383719ee96ab1
font_01_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 10360 bytes
SHA-256: 65ea63cee734fd6177908056e6abc1c037fdd70b0378e09e6c37c04833aac29b
font_02_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1