Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe48b6cf8a099b1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 06:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6ec8987703a43961a9038bcd2c199569 SHA-1: 32f0c11fd0ec7871973166c4050ec45950fb4d0b SHA-256: dfe48b6cf8a099b19477f664afebc0b63857721e5b4439bc62f07fc86eaba4bc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=hookup+websites+completely+free PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4446eec74f8a6fd0a871f53a6bb8df0/ritipadiwalo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/mezegotududuvikunamavi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302fd33cb0a---65710377288.pdfIn PDF document text
    • http://client.diffuse.info/files/vevovo.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/labatelabalij.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/nerovopolipez.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161327b8e45562---bavifetifo.pdfIn PDF document text
    • https://balticseaheritage.com/res/wysiwyg/file/2991722649.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/79796856016.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/gevoxovilasegakuzufeseg.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f0acad5969904f764ca85183a574b360/22491423950.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/90698429401.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/nolowozipenipejam.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/64665334294.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/89316304457.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/64d33bd4786b0f48469cc70e7bb8b1d1/47283527953.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/57364420763.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/25954330117.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/32c15a225b19996916e07e9d6b3a56ed/kaguzubesuzumuxav.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/38659191833.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r3dcidkbn35ff34oor6p22sqf3/85081492424.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/52426993836.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1615203268eed6---94639343995.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_off0000b190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB190 10896 bytes
SHA-256: d56afc75f51a31dc9ea872a6ea128ce4cca28c94b6d3a46faa36a0ceb935f605
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 14624 bytes
SHA-256: 5edd2710455f2daff8b346f0617930d25ab8e88b4993a4c5980e1039e25a58a7
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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