Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89d10537c418132…

MALICIOUS

PDF

75.7 KB Created: 2021-07-08 09:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20997682b173b58be171e6ada9dfed7a SHA-1: a4f78ae029a40257d3b0df7a49effc9f4ca84e1f SHA-256: e89d10537c4181321d564599a343e562d176bc80393bc0de3dc862a48bc48542
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=all+checks+cashed PDF link annotation
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/semapunuvuku.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/53c714b4aabbcab4e833dfd6f2d4defb/gixisodesidekedogo.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/ledavufezinonamopuvujaxov.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/41874301874.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/daxepifasanegerenekebul.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/lozowumatijebupawu.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/7352127167.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/18586494858.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/keruw.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64767013214.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b0c41230c749ece72206e3a4976046b1/venojipasowilolaz.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084afbf74a59---ruzejadevuda.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b12e62a82c3da5c801ddf3b8cdf97f8a/68991211759.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/14555664847.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/zubulima.pdfIn PDF document text
    • https://angkagenap.com/contents//files/11301691928.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/80833038551.pdfIn PDF document text
    • https://educhina.mn/editor/files/panotemokem.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/zoxitazesafen.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tabomvv8cugauono1gdi6knav1/bubiponixaguxonofe.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/81ad9e340d3e9ef790479bfef78f941c/dazoxixa.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_off0000c7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 16728 bytes
SHA-256: df242fe08b60ddfe54e49ebc162fd01966853e9132616f73bf5ec5877e98b348
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10024 bytes
SHA-256: f619ed62c1b4bce5e80f0be20c739af80ad23bdef41b168e10f73a81ededea7d
font_02_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1