Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f7a7fd48752837…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 11:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 938b59805765b6ab82c527217698a719 SHA-1: f31594373b3cc540ca2800337c9e44dbf3e99417 SHA-256: 28f7a7fd487528372027650535be6e77b0c457e69ee2a746c050a3a5dbd12757
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that redirect to potentially harmful websites. The presence of compromised CMS upload links and disposable hosting further supports its use in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=minecraft+house+interior+ideas PDF link annotation
    • http://grandp.ru/userfiles/file/jagezoxi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/97647278761.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/7932409256.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/sulukugubalo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4a39597b---sorafejukarivukafu.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pugabuwurelitadamo.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/nititakowofaxafo.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vuletuvuzumorenifiwepet.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/wuvuxumikonarini.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/61088290844.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d1aad5e9cabbbc4d3371e87af4299a73/xefezoxijubeviru.pdfIn PDF document text
    • https://cmf8.ir/data/file/ranemubeluxid.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/86679133264.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23065442119.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/suluwejuza.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/64306899172.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zufurazemamilaxatasola.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88351460712.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/99485650137.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/31613042788.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/zupapofawigu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142c8d30df62---54020065104.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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 10620 bytes
SHA-256: a467110696c184dc2730be4a7a1e26d39c5caaa6593dc4016c51fadf8d412f6d
font_01_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 14828 bytes
SHA-256: 57e6739a23521f57317450d9f9dab906c70d378d631d5265514d1909eb4de3e6
font_02_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1